Add README and agent guidelines documentation

README covers building, running, connecting, world data format,
game mechanics, database schema, mudtool usage, and admin system.
AGENTS.md provides architecture overview, concurrency model, coding
conventions, and step-by-step guides for extending the codebase.

Made-with: Cursor

AGENTS.md

@@ -0,0 +1,120 @@
+# Agent Guidelines — MUD Server
+
+Instructions for AI coding agents working on this codebase.
+
+## Project Overview
+
+This is a Rust MUD server that accepts SSH connections. The architecture separates the binary server/game engine from data-driven world content defined in TOML files.
+
+**Key design decisions:**
+- Game runs on a **tick-based loop** (~3s). Combat, status effects, NPC AI, and regen resolve on ticks, not on player input.
+- Any NPC can be attacked. Hostility is a consequence system, not a permission system.
+- Status effects persist in the database and continue ticking while players are offline.
+- The `GameDb` trait abstracts the database backend (currently SQLite).
+- World data is loaded from TOML at startup. Content changes don't require recompilation.
+
+## Architecture
+
+```
+src/
+├── main.rs        Entry point: arg parsing, world/db init, tick spawn, SSH listen
+├── lib.rs         Library crate — exports all modules for shared use by mudserver + mudtool
+├── ssh.rs         russh server/handler: connection lifecycle, chargen flow, command dispatch
+├── game.rs        Core runtime state: Player, GameState, SharedState, XorShift64 RNG
+├── commands.rs    Player command parsing and execution (immediate + queued actions)
+├── combat.rs      Tick-based combat resolution: attack, defend, flee, item use
+├── tick.rs        Background tick engine: NPC AI, combat rounds, effects, respawns, regen
+├── admin.rs       Admin command implementations
+├── chargen.rs     Character creation state machine
+├── db.rs          GameDb trait + SqliteDb implementation
+├── world.rs       TOML schema types, runtime types, World::load()
+├── ansi.rs        ANSI escape code helpers
+└── bin/
+    └── mudtool.rs External DB management tool (CLI + TUI)
+```
+
+## Concurrency Model
+
+- `SharedState` = `Arc<Mutex<GameState>>` (tokio mutex)
+- The tick engine and SSH handlers both lock `GameState`. Locks are held briefly.
+- Player output from ticks is collected into a `HashMap<pid, String>`, then sent after dropping the lock.
+- Never hold the game state lock across `.await` points that involve network I/O.
+
+## How Combat Works
+
+1. Player types `attack <npc>` → enters `CombatState` with `action: Some(Attack)`
+2. Player can queue a different action before the tick fires (`defend`, `flee`, `use <item>`)
+3. Tick engine iterates all players in combat, calls `combat::resolve_combat_tick()`
+4. Resolution: execute player action → NPC counter-attacks → check death → clear action
+5. If no action was queued, default is `Attack`
+6. NPC auto-aggro: hostile NPCs initiate combat with players in their room on each tick
+
+## How Status Effects Work
+
+- Stored in `status_effects` table: `(player_name, kind, remaining_ticks, magnitude)`
+- `tick_all_effects()` decrements all rows, returns them, then deletes expired ones
+- Online players: HP modified in-memory + saved to DB
+- Offline players: HP modified directly in `players` table via DB
+- Effects cleared on player death
+
+## Adding New Features
+
+### New command
+1. Add handler function in `commands.rs` (follow `cmd_*` pattern)
+2. Add match arm in the `execute()` dispatch
+3. If it's a combat action, queue it on `combat.action` instead of executing immediately
+4. Update `cmd_help()` text
+5. Add to TESTING.md checklist
+
+### New status effect kind
+1. Add a match arm in `tick.rs` under the effect processing loop
+2. Handle both online (in-memory) and offline (DB-only) players
+3. The `kind` field is a free-form string — no enum needed
+
+### New NPC behavior
+1. NPC AI runs in `tick.rs` at the top of the tick cycle
+2. Currently: hostile NPCs auto-engage players in their room
+3. Add new behaviors there (e.g. NPC movement, dialogue triggers)
+
+### New world content
+1. Add TOML files under `world/<region>/` — no code changes needed
+2. NPCs without a `[combat]` section get default stats (20hp/4atk/2def/5xp)
+3. Room IDs are `<region_dir>:<filename_stem>`
+4. Cross-region exits work — just reference the full ID
+
+### New DB table
+1. Add `CREATE TABLE IF NOT EXISTS` in `SqliteDb::open()`
+2. Add trait methods to `GameDb`
+3. Implement for `SqliteDb`
+4. Update `mudtool` if the data should be manageable externally
+
+## Conventions
+
+- **No unnecessary comments.** Don't narrate what code does. Comments explain non-obvious intent only.
+- **KISS.** Don't add abstraction layers unless there's a concrete second use case.
+- **Borrow checker patterns:** This codebase frequently needs to work around Rust's borrow rules when mutating `GameState`. Common pattern: read data into locals, drop the borrow, then mutate. See `cmd_attack` for examples.
+- **ANSI formatting:** Use helpers in `ansi.rs`. Don't hardcode escape codes elsewhere.
+- **Error handling:** Game logic uses `Option`/early-return patterns, not `Result` chains. DB errors are silently swallowed (logged at debug level) — the game should not crash from a failed DB write.
+- **Testing:** There is no automated test suite. `TESTING.md` contains a manual checklist and smoke test script. Run through relevant sections before committing.
+
+## Common Pitfalls
+
+- **Holding the lock too long:** `state.lock().await` grabs a tokio mutex. If you `.await` network I/O while holding it, the tick engine and all other players will block. Collect data, drop the lock, then send.
+- **Borrow splitting:** `GameState` owns `world`, `players`, `npc_instances`, and `db`. You can't borrow `players` mutably while also reading `world` through the same `&mut GameState`. Extract what you need from `world` first.
+- **Tick engine ordering:** The tick processes in this order: respawns → NPC aggro → combat rounds → status effects → passive regen → send messages. Changing this order can create bugs (e.g. regen before combat means players heal before taking damage).
+- **Offline player effects:** Status effects tick in the DB for ALL players. If you add a new effect, handle both the online path (modify in-memory player) and offline path (load/modify/save via `SavedPlayer`).
+
+## Build & Run
+
+```bash
+cargo build
+./target/debug/mudserver --world ./world --db ./mudserver.db --port 2222
+ssh testplayer@localhost -p 2222
+```
+
+## Git
+
+- Remote: `https://git.coven.systems/lily/mudserver`
+- Commit messages: imperative mood, explain why not what
+- Update `TESTING.md` when adding features
+- Run through the relevant test checklist sections before pushing

README.md

@@ -0,0 +1,276 @@
+# MUD Server
+
+A text-based multiplayer RPG (MUD) that accepts connections over SSH. Written in Rust with a data-driven world definition system — rooms, NPCs, objects, races, and classes are all defined in TOML files and can be changed without recompiling.
+
+## Requirements
+
+- Rust toolchain (edition 2021+)
+- SQLite is bundled via `rusqlite` — no system SQLite needed
+
+## Building
+
+```bash
+cargo build            # builds both mudserver and mudtool
+cargo build --release  # optimized build
+```
+
+This produces two binaries:
+- `mudserver` — the game server
+- `mudtool` — database management CLI/TUI
+
+## Running the Server
+
+```bash
+./target/debug/mudserver
+```
+
+### Options
+
+| Flag | Default | Description |
+|------|---------|-------------|
+| `--port`, `-p` | `2222` | SSH listen port |
+| `--world`, `-w` | `./world` | Path to world data directory |
+| `--db`, `-d` | `./mudserver.db` | Path to SQLite database file |
+
+The server generates a random SSH host key on each startup. The database is created automatically if it doesn't exist.
+
+### Connecting
+
+Any SSH client works. The username becomes the player's character name:
+
+```bash
+ssh mycharacter@localhost -p 2222
+```
+
+Password and key auth are both accepted (no real authentication — this is a game server, not a secure shell).
+
+### Environment
+
+Set `RUST_LOG` to control log verbosity:
+
+```bash
+RUST_LOG=info ./target/release/mudserver    # default
+RUST_LOG=debug ./target/release/mudserver   # verbose
+```
+
+## World Data
+
+The world is defined entirely in TOML files under a `world/` directory. The server reads this at startup — no recompilation needed to change content.
+
+### Directory Structure
+
+```
+world/
+├── manifest.toml              # world name and spawn room
+├── races/                     # playable races
+│   ├── dwarf.toml
+│   ├── elf.toml
+│   └── ...
+├── classes/                   # playable classes
+│   ├── warrior.toml
+│   ├── mage.toml
+│   └── ...
+└── <region>/                  # one directory per region
+    ├── region.toml            # region metadata
+    ├── rooms/
+    │   ├── town_square.toml
+    │   └── ...
+    ├── npcs/
+    │   ├── barkeep.toml
+    │   └── ...
+    └── objects/
+        ├── rusty_sword.toml
+        └── ...
+```
+
+### manifest.toml
+
+```toml
+name = "The Shattered Realm"
+spawn_room = "town:town_square"
+```
+
+### Room
+
+```toml
+name = "Town Square"
+description = "A cobblestone square with a fountain."
+
+[exits]
+north = "town:tavern"
+south = "town:gate"
+east = "town:market"
+```
+
+Room IDs are `<region>:<filename_stem>`.
+
+### NPC
+
+```toml
+name = "Town Guard"
+description = "A bored guard."
+room = "town:gate"
+base_attitude = "neutral"   # friendly, neutral, wary, aggressive, hostile
+faction = "guards"           # optional — attitude shifts propagate to faction
+respawn_secs = 90            # optional — respawn timer after death
+
+[dialogue]
+greeting = "Move along."
+
+[combat]                     # optional — omit for weak default stats (20hp/4atk/2def/5xp)
+max_hp = 60
+attack = 10
+defense = 8
+xp_reward = 25
+```
+
+### Object
+
+```toml
+name = "Rusty Sword"
+description = "A battered iron blade."
+room = "town:cellar"
+kind = "weapon"              # weapon, armor, consumable, treasure, or omit
+takeable = true
+
+[stats]
+damage = 5                   # for weapons
+# armor = 4                  # for armor
+# heal_amount = 30           # for consumables
+```
+
+### Race
+
+```toml
+name = "Dwarf"
+description = "Stout and unyielding."
+
+[stats]
+strength = 1
+dexterity = -1
+constitution = 2
+```
+
+### Class
+
+```toml
+name = "Warrior"
+description = "Masters of arms and armor."
+
+[base_stats]
+max_hp = 120
+attack = 14
+defense = 12
+
+[growth]
+hp_per_level = 15
+attack_per_level = 3
+defense_per_level = 2
+```
+
+## Game Mechanics
+
+### Tick System
+
+The game runs on a **3-second tick cycle**. Combat actions, status effects, NPC AI, and passive regeneration all resolve on ticks rather than immediately.
+
+### Combat
+
+Combat is tick-based. When a player enters combat (via `attack` or NPC aggro), they choose actions each tick:
+
+| Command | Effect |
+|---------|--------|
+| `attack` / `a` | Strike the enemy (default if no action queued) |
+| `defend` / `def` | Brace — doubles effective defense for the tick |
+| `flee` | Attempt to escape (success chance based on DEF stat) |
+| `use <item>` | Use a consumable during combat |
+
+Any NPC can be attacked. Attacking non-hostile NPCs carries attitude penalties (-30 individual, -15 faction) and a warning message but is not blocked.
+
+### Attitude System
+
+Every NPC tracks a per-player attitude value from -100 to +100:
+
+| Range | Label | Behavior |
+|-------|-------|----------|
+| 50 to 100 | Friendly | Will talk |
+| 10 to 49 | Neutral | Will talk |
+| -24 to 9 | Wary | Will talk |
+| -25 to -74 | Aggressive | Won't talk, attackable |
+| -75 to -100 | Hostile | Attacks on sight |
+
+Attitudes shift from combat interactions and propagate through NPC factions.
+
+### Status Effects
+
+Effects like poison and regeneration are stored in the database and tick down every cycle — including while the player is offline. Effects are cleared on death.
+
+### Passive Regeneration
+
+Players out of combat regenerate 5% of max HP every 5 ticks (~15 seconds).
+
+## Database
+
+SQLite with WAL mode. Tables:
+
+- `players` — character data (stats, inventory, equipment, room, admin flag)
+- `npc_attitudes` — per-player, per-NPC attitude values
+- `server_settings` — key-value config (e.g. `registration_open`)
+- `status_effects` — active effects with remaining tick counters
+
+The database is accessed through a `GameDb` trait, making backend swaps possible.
+
+## mudtool
+
+Database management tool with both CLI and TUI modes.
+
+### CLI
+
+```bash
+mudtool --db ./mudserver.db players list
+mudtool --db ./mudserver.db players show hero
+mudtool --db ./mudserver.db players set-admin hero true
+mudtool --db ./mudserver.db players delete hero
+mudtool --db ./mudserver.db settings list
+mudtool --db ./mudserver.db settings set registration_open false
+mudtool --db ./mudserver.db attitudes list hero
+mudtool --db ./mudserver.db attitudes set hero town:guard 50
+```
+
+### TUI
+
+```bash
+mudtool --db ./mudserver.db tui
+```
+
+Interactive interface with tabs for Players, Settings, and Attitudes. Navigate with arrow keys, Tab/1/2/3 to switch tabs, `a` to toggle admin, `d` to delete, Enter to edit values, `q` to quit.
+
+## Admin System
+
+Players with the `is_admin` flag can use in-game admin commands:
+
+```
+admin promote <player>              Grant admin
+admin demote <player>               Revoke admin
+admin kick <player>                 Disconnect player
+admin teleport <room_id>            Warp to room
+admin registration on|off           Toggle new player creation
+admin announce <message>            Broadcast to all
+admin heal [player]                 Full heal (self or target)
+admin info <player>                 Detailed player info
+admin setattitude <player> <npc> <value>  Set attitude
+admin list                          All players (online + saved)
+```
+
+The first admin must be set via `mudtool players set-admin <name> true`.
+
+## Registration Gate
+
+New player creation can be toggled:
+
+```bash
+mudtool settings set registration_open false   # block new players
+mudtool settings set registration_open true    # allow new players (default)
+```
+
+Or in-game: `admin registration off` / `admin registration on`. Existing players can always log in regardless of this setting.

TESTING.md

@@ -39,21 +39,24 @@ Run through these checks before every commit to ensure consistent feature covera
 - [ ] Dead NPCs don't appear in room view
 
 ## Combat - Tick-Based
-- [ ] `attack <aggressive/hostile npc>` enters combat state
+- [ ] `attack <npc>` enters combat state with any NPC that has combat stats
-- [ ] Can't attack friendly/neutral NPCs
+- [ ] Attacking friendly/neutral NPCs is allowed but incurs attitude penalties
+- [ ] Attacking non-hostile NPC: attitude shift -30 individual, -15 faction
+- [ ] "The locals look on in horror" message when attacking non-hostile
 - [ ] Combat rounds resolve automatically on server ticks (not on command)
 - [ ] Player receives tick-by-tick combat output (damage dealt, damage taken)
 - [ ] Default combat action is "attack" if no other action queued
 - [ ] `defend` / `def` sets defensive stance (reduced incoming damage next tick)
 - [ ] NPC death: awards XP, shifts attitude -10, shifts faction -5
-- [ ] Player death: respawns at spawn room with full HP, combat cleared
+- [ ] Player death: respawns at spawn room with full HP, combat cleared, effects cleared
 - [ ] NPCs respawn after configured time
-- [ ] Combat lockout: can only attack/defend/flee/look/use/quit during combat
+- [ ] Combat lockout: can only attack/defend/flee/look/stats/inv/use/quit during combat
 - [ ] `flee` queues escape attempt — may fail based on stats
 - [ ] `use <item>` in combat queues item use for next tick
 - [ ] Multiple ticks of combat resolve correctly without player input
 - [ ] Combat ends when NPC dies (player exits combat state)
 - [ ] Combat ends when player flees successfully
+- [ ] NPCs without explicit [combat] section get default stats (20 HP, 4 ATK, 2 DEF, 5 XP)
 
 ## Combat - NPC AI
 - [ ] Hostile NPCs auto-engage players who enter their room
@@ -88,7 +91,7 @@ Run through these checks before every commit to ensure consistent feature covera
 - [ ] HP does not exceed max_hp
 
 ## Tick Engine
-- [ ] Tick runs at configured interval (~2 seconds)
+- [ ] Tick runs at configured interval (~3 seconds)
 - [ ] Tick processes: NPC AI → combat rounds → status effects → respawns → regen
 - [ ] Tick output is delivered to players promptly
 - [ ] Server remains responsive to immediate commands between ticks

src/combat.rs

@@ -1,51 +1,75 @@
 use std::time::Instant;
 
 use crate::ansi;
-use crate::game::GameState;
+use crate::game::{CombatAction, GameState};
 
 pub struct CombatRoundResult {
     pub output: String,
     pub npc_died: bool,
     pub player_died: bool,
     pub xp_gained: i32,
+    pub fled: bool,
 }
 
-pub fn do_attack(player_id: usize, npc_id: &str, state: &mut GameState) -> Option<CombatRoundResult> {
+pub fn resolve_combat_tick(
-    let npc_template = state.world.get_npc(npc_id)?.clone();
+    player_id: usize,
+    state: &mut GameState,
+) -> Option<CombatRoundResult> {
+    let (npc_id, action, was_defending) = {
+        let conn = state.players.get(&player_id)?;
+        let combat = conn.combat.as_ref()?;
+        let action = combat.action.clone().unwrap_or(CombatAction::Attack);
+        (combat.npc_id.clone(), action, combat.defending)
+    };
+
+    let npc_template = state.world.get_npc(&npc_id)?.clone();
     let npc_combat = npc_template.combat.as_ref()?;
 
-    let instance = state.npc_instances.get(npc_id)?;
+    let instance = state.npc_instances.get(&npc_id)?;
     if !instance.alive {
-        return None;
+        if let Some(conn) = state.players.get_mut(&player_id) {
+            conn.combat = None;
+        }
+        return Some(CombatRoundResult {
+            output: format!(
+                "  {} {} is already dead. Combat ended.\r\n",
+                ansi::color(ansi::DIM, "--"),
+                npc_template.name,
+            ),
+            npc_died: false,
+            player_died: false,
+            xp_gained: 0,
+            fled: false,
+        });
     }
-    let npc_hp_before = instance.hp;
 
+    let npc_hp_before = instance.hp;
     let conn = state.players.get(&player_id)?;
     let p_atk = conn.player.effective_attack();
     let p_def = conn.player.effective_defense();
-
+    let _ = conn;
-    // Player attacks NPC
-    let roll: i32 = (simple_random() % 6) as i32 + 1;
-    let player_dmg = (p_atk - npc_combat.defense / 2 + roll).max(1);
-
-    let new_npc_hp = (npc_hp_before - player_dmg).max(0);
 
     let mut out = String::new();
-    out.push_str(&format!(
-        "  {} You strike {} for {} damage!{}\r\n",
-        ansi::color(ansi::YELLOW, ">>"),
-        ansi::color(ansi::RED, &npc_template.name),
-        ansi::bold(&player_dmg.to_string()),
-        ansi::RESET,
-    ));
-
     let mut npc_died = false;
     let mut player_died = false;
     let mut xp_gained = 0;
+    let mut fled = false;
+
+    match action {
+        CombatAction::Attack => {
+            let roll = state.rng.next_range(1, 6);
+            let player_dmg = (p_atk - npc_combat.defense / 2 + roll).max(1);
+            let new_npc_hp = (npc_hp_before - player_dmg).max(0);
+
+            out.push_str(&format!(
+                "  {} You strike {} for {} damage!\r\n",
+                ansi::color(ansi::YELLOW, ">>"),
+                ansi::color(ansi::RED, &npc_template.name),
+                ansi::bold(&player_dmg.to_string()),
+            ));
 
             if new_npc_hp <= 0 {
-        // NPC dies
+                if let Some(inst) = state.npc_instances.get_mut(&npc_id) {
-        if let Some(inst) = state.npc_instances.get_mut(npc_id) {
                     inst.alive = false;
                     inst.hp = 0;
                     inst.death_time = Some(Instant::now());
@@ -60,17 +84,14 @@ pub fn do_attack(player_id: usize, npc_id: &str, state: &mut GameState) -> Optio
                     ansi::bold(&xp_gained.to_string()),
                 ));
 
-        // Clear combat state
                 if let Some(conn) = state.players.get_mut(&player_id) {
                     conn.combat = None;
                     conn.player.stats.xp += xp_gained;
                 }
             } else {
-        // Update NPC HP
+                if let Some(inst) = state.npc_instances.get_mut(&npc_id) {
-        if let Some(inst) = state.npc_instances.get_mut(npc_id) {
                     inst.hp = new_npc_hp;
                 }
-
                 out.push_str(&format!(
                     "  {} {} HP: {}/{}\r\n",
                     ansi::color(ansi::DIM, "  "),
@@ -78,10 +99,105 @@ pub fn do_attack(player_id: usize, npc_id: &str, state: &mut GameState) -> Optio
                     new_npc_hp,
                     npc_combat.max_hp,
                 ));
+            }
+        }
+        CombatAction::Defend => {
+            if let Some(conn) = state.players.get_mut(&player_id) {
+                if let Some(ref mut combat) = conn.combat {
+                    combat.defending = true;
+                }
+            }
+            out.push_str(&format!(
+                "  {} You brace yourself and raise your guard.\r\n",
+                ansi::color(ansi::CYAN, "[]"),
+            ));
+        }
+        CombatAction::Flee => {
+            let flee_chance = 40 + (p_def / 2).min(30);
+            let roll = state.rng.next_range(1, 100);
+            if roll <= flee_chance {
+                if let Some(conn) = state.players.get_mut(&player_id) {
+                    conn.combat = None;
+                }
+                fled = true;
+                out.push_str(&format!(
+                    "  {} You disengage and flee from combat!\r\n",
+                    ansi::color(ansi::GREEN, "<<"),
+                ));
+            } else {
+                out.push_str(&format!(
+                    "  {} You try to flee but {} blocks your escape!\r\n",
+                    ansi::color(ansi::RED, "!!"),
+                    ansi::color(ansi::RED, &npc_template.name),
+                ));
+            }
+        }
+        CombatAction::UseItem(idx) => {
+            if let Some(conn) = state.players.get_mut(&player_id) {
+                if idx < conn.player.inventory.len() {
+                    let obj = &conn.player.inventory[idx];
+                    if obj.kind.as_deref() == Some("consumable") {
+                        let heal = obj.stats.heal_amount.unwrap_or(0);
+                        let name = obj.name.clone();
+                        conn.player.inventory.remove(idx);
+                        let old_hp = conn.player.stats.hp;
+                        conn.player.stats.hp =
+                            (conn.player.stats.hp + heal).min(conn.player.stats.max_hp);
+                        let healed = conn.player.stats.hp - old_hp;
+                        out.push_str(&format!(
+                            "  {} You use the {}. Restored {} HP.\r\n",
+                            ansi::color(ansi::GREEN, "++"),
+                            ansi::color(ansi::CYAN, &name),
+                            ansi::bold(&healed.to_string()),
+                        ));
+                    } else {
+                        out.push_str(&format!(
+                            "  {} You can't use that in combat.\r\n",
+                            ansi::color(ansi::RED, "!!"),
+                        ));
+                    }
+                } else {
+                    out.push_str(&format!(
+                        "  {} Item not found in inventory.\r\n",
+                        ansi::color(ansi::RED, "!!"),
+                    ));
+                }
+            }
+        }
+    }
 
-        // NPC attacks player
+    // Clear the queued action
-        let npc_roll: i32 = (simple_random() % 6) as i32 + 1;
+    if let Some(conn) = state.players.get_mut(&player_id) {
-        let npc_dmg = (npc_combat.attack - p_def / 2 + npc_roll).max(1);
+        if let Some(ref mut combat) = conn.combat {
+            combat.action = None;
+        }
+    }
+
+    // NPC counter-attack (if player is still in combat and NPC is alive)
+    let still_in_combat = state
+        .players
+        .get(&player_id)
+        .map(|c| c.combat.is_some())
+        .unwrap_or(false);
+    let npc_alive = state
+        .npc_instances
+        .get(&npc_id)
+        .map(|i| i.alive)
+        .unwrap_or(false);
+
+    if still_in_combat && npc_alive && !fled {
+        let is_defending = state
+            .players
+            .get(&player_id)
+            .and_then(|c| c.combat.as_ref())
+            .map(|c| c.defending)
+            .unwrap_or(was_defending);
+
+        let defense_mult = if is_defending { 2.0 } else { 1.0 };
+        let effective_def = (p_def as f32 * defense_mult) as i32;
+
+        let npc_roll = state.rng.next_range(1, 6);
+        let npc_dmg = (npc_combat.attack - effective_def / 2 + npc_roll).max(1);
 
         if let Some(conn) = state.players.get_mut(&player_id) {
             conn.player.stats.hp = (conn.player.stats.hp - npc_dmg).max(0);
@@ -89,10 +205,11 @@ pub fn do_attack(player_id: usize, npc_id: &str, state: &mut GameState) -> Optio
             let max_hp = conn.player.stats.max_hp;
 
             out.push_str(&format!(
-                "  {} {} strikes you for {} damage!\r\n",
+                "  {} {} strikes you for {} damage!{}\r\n",
                 ansi::color(ansi::RED, "<<"),
                 ansi::color(ansi::RED, &npc_template.name),
                 ansi::bold(&npc_dmg.to_string()),
+                if is_defending { " (blocked some)" } else { "" },
             ));
 
             let hp_color = if hp * 3 < max_hp {
@@ -115,6 +232,11 @@ pub fn do_attack(player_id: usize, npc_id: &str, state: &mut GameState) -> Optio
                 player_died = true;
                 conn.combat = None;
             }
+
+            // Reset defending after the round
+            if let Some(ref mut combat) = conn.combat {
+                combat.defending = false;
+            }
         }
     }
 
@@ -123,32 +245,32 @@ pub fn do_attack(player_id: usize, npc_id: &str, state: &mut GameState) -> Optio
         npc_died,
         player_died,
         xp_gained,
+        fled,
     })
 }
 
 pub fn player_death_respawn(player_id: usize, state: &mut GameState) -> String {
     let spawn_room = state.spawn_room().to_string();
+    let player_name = state
+        .players
+        .get(&player_id)
+        .map(|c| c.player.name.clone())
+        .unwrap_or_default();
+
     if let Some(conn) = state.players.get_mut(&player_id) {
         conn.player.stats.hp = conn.player.stats.max_hp;
         conn.player.room_id = spawn_room;
         conn.combat = None;
     }
 
+    // Clear status effects on death
+    state.db.clear_effects(&player_name);
+
     format!(
-        "\r\n{}\r\n{}\r\n{}\r\n",
+        "\r\n{}\r\n{}\r\n{}\r\n{}\r\n",
         ansi::color(ansi::RED, "  ╔═══════════════════════════╗"),
         ansi::color(ansi::RED, "  ║      YOU HAVE DIED!       ║"),
         ansi::color(ansi::RED, "  ╚═══════════════════════════╝"),
-    ) + &format!(
+        ansi::system_msg("You awaken at the town square, fully healed."),
-        "{}\r\n",
-        ansi::system_msg("You awaken at the town square, fully healed.")
     )
 }
-
-fn simple_random() -> u32 {
-    use std::time::SystemTime;
-    let d = SystemTime::now()
-        .duration_since(SystemTime::UNIX_EPOCH)
-        .unwrap_or_default();
-    ((d.as_nanos() >> 4) ^ (d.as_nanos() >> 16)) as u32
-}

src/commands.rs

@@ -3,8 +3,7 @@ use russh::{ChannelId, CryptoVec};
 
 use crate::admin;
 use crate::ansi;
-use crate::combat;
+use crate::game::{CombatAction, CombatState, SharedState};
-use crate::game::{CombatState, SharedState};
 use crate::world::Attitude;
 
 pub struct BroadcastMsg {
@@ -61,14 +60,15 @@ pub async fn execute(
         None => (input.to_lowercase(), String::new()),
     };
 
-    // Combat lockout
+    // Combat lockout: only certain commands allowed
     {
         let st = state.lock().await;
         if let Some(conn) = st.players.get(&player_id) {
             if conn.combat.is_some()
                 && !matches!(
                     cmd.as_str(),
-                    "attack" | "a" | "flee" | "look" | "l" | "quit" | "exit"
+                    "attack" | "a" | "defend" | "def" | "flee" | "use" | "look" | "l"
+                        | "stats" | "st" | "inventory" | "inv" | "i" | "quit" | "exit"
                 )
             {
                 drop(st);
@@ -77,7 +77,9 @@ pub async fn execute(
                     channel,
                     &format!(
                         "{}\r\n{}",
-                        ansi::error_msg("You're in combat! Use 'attack', 'flee', or 'look'."),
+                        ansi::error_msg(
+                            "You're in combat! Use 'attack', 'defend', 'flee', 'use', 'look', 'stats', or 'inventory'."
+                        ),
                         ansi::prompt()
                     ),
                 )?;
@@ -101,6 +103,7 @@ pub async fn execute(
         "examine" | "ex" | "x" => cmd_examine(player_id, &args, state).await,
         "talk" => cmd_talk(player_id, &args, state).await,
         "attack" | "a" => cmd_attack(player_id, &args, state).await,
+        "defend" | "def" => cmd_defend(player_id, state).await,
         "flee" => cmd_flee(player_id, state).await,
         "stats" | "st" => cmd_stats(player_id, state).await,
         "admin" => cmd_admin(player_id, &args, state).await,
@@ -236,8 +239,35 @@ async fn cmd_look(pid: usize, state: &SharedState) -> CommandResult {
         Some(c) => c.player.room_id.clone(),
         None => return simple("Error\r\n"),
     };
+    let mut out = render_room_view(&rid, pid, &st);
+
+    // Show combat status if in combat
+    if let Some(conn) = st.players.get(&pid) {
+        if let Some(ref combat) = conn.combat {
+            if let Some(npc) = st.world.get_npc(&combat.npc_id) {
+                let npc_hp = st
+                    .npc_instances
+                    .get(&combat.npc_id)
+                    .map(|i| i.hp)
+                    .unwrap_or(0);
+                let npc_max = npc
+                    .combat
+                    .as_ref()
+                    .map(|c| c.max_hp)
+                    .unwrap_or(1);
+                out.push_str(&format!(
+                    "\r\n  {} In combat with {} (HP: {}/{})\r\n",
+                    ansi::color(ansi::RED, "!!"),
+                    ansi::color(ansi::RED, &npc.name),
+                    npc_hp,
+                    npc_max,
+                ));
+            }
+        }
+    }
+
     CommandResult {
-        output: render_room_view(&rid, pid, &st),
+        output: out,
         broadcasts: Vec::new(),
         kick_targets: Vec::new(),
         quit: false,
@@ -249,6 +279,16 @@ async fn cmd_go(pid: usize, direction: &str, state: &SharedState) -> CommandResu
     let direction = resolve_dir(&dl);
     let mut st = state.lock().await;
 
+    // Block movement in combat
+    if let Some(conn) = st.players.get(&pid) {
+        if conn.combat.is_some() {
+            return simple(&format!(
+                "{}\r\n",
+                ansi::error_msg("You can't move while in combat! Use 'flee' to escape.")
+            ));
+        }
+    }
+
     let (old_rid, new_rid, pname) = {
         let conn = match st.players.get(&pid) {
             Some(c) => c,
@@ -380,12 +420,14 @@ async fn cmd_who(pid: usize, state: &SharedState) -> CommandResult {
             .unwrap_or("???");
         let m = if c.player.name == sn { " (you)" } else { "" };
         let admin_tag = if c.player.is_admin { " [ADMIN]" } else { "" };
+        let combat_tag = if c.combat.is_some() { " [COMBAT]" } else { "" };
         out.push_str(&format!(
-            "  {} — {}{}{}\r\n",
+            "  {} — {}{}{}{}\r\n",
             ansi::player_name(&c.player.name),
             ansi::room_name(rn),
             ansi::system_msg(m),
             ansi::color(ansi::YELLOW, admin_tag),
+            ansi::color(ansi::RED, combat_tag),
         ));
     }
     out.push_str(&format!(
@@ -635,6 +677,35 @@ async fn cmd_use(pid: usize, target: &str, state: &SharedState) -> CommandResult
             ))
         }
     };
+
+    // In combat: queue the use action for the next tick
+    if conn.combat.is_some() {
+        let obj = &conn.player.inventory[idx];
+        if obj.kind.as_deref() != Some("consumable") {
+            return simple(&format!(
+                "{}\r\n",
+                ansi::error_msg(&format!("You can't use the {} in combat.", obj.name))
+            ));
+        }
+        if let Some(ref mut combat) = conn.combat {
+            combat.action = Some(CombatAction::UseItem(idx));
+        }
+        let name = obj.name.clone();
+        return CommandResult {
+            output: format!(
+                "{}\r\n",
+                ansi::system_msg(&format!(
+                    "You prepare to use the {}... (resolves next tick)",
+                    name
+                ))
+            ),
+            broadcasts: Vec::new(),
+            kick_targets: Vec::new(),
+            quit: false,
+        };
+    }
+
+    // Out of combat: use immediately
     let obj = &conn.player.inventory[idx];
     if obj.kind.as_deref() != Some("consumable") {
         return simple(&format!(
@@ -800,30 +871,57 @@ async fn cmd_talk(pid: usize, target: &str, state: &SharedState) -> CommandResul
 async fn cmd_attack(pid: usize, target: &str, state: &SharedState) -> CommandResult {
     let mut st = state.lock().await;
 
+    // If already in combat, queue attack action
+    let already_in_combat = st
+        .players
+        .get(&pid)
+        .map(|c| c.combat.is_some())
+        .unwrap_or(false);
+    if already_in_combat {
+        let npc_name = st
+            .players
+            .get(&pid)
+            .and_then(|c| c.combat.as_ref())
+            .and_then(|combat| st.world.get_npc(&combat.npc_id))
+            .map(|n| n.name.clone())
+            .unwrap_or_else(|| "???".into());
+        if let Some(conn) = st.players.get_mut(&pid) {
+            if let Some(ref mut combat) = conn.combat {
+                combat.action = Some(CombatAction::Attack);
+            }
+        }
+        return CommandResult {
+            output: format!(
+                "{}\r\n",
+                ansi::system_msg(&format!(
+                    "You ready an attack against {}... (resolves next tick)",
+                    npc_name
+                ))
+            ),
+            broadcasts: Vec::new(),
+            kick_targets: Vec::new(),
+            quit: false,
+        };
+    }
+
+    // Not in combat: initiate combat
+    if target.is_empty() {
+        return simple("Attack what?\r\n");
+    }
+
     let npc_id = {
         let conn = match st.players.get(&pid) {
             Some(c) => c,
             None => return simple("Error\r\n"),
         };
-        if let Some(ref combat) = conn.combat {
-            combat.npc_id.clone()
-        } else {
-            if target.is_empty() {
-                return simple("Attack what?\r\n");
-            }
         let room = match st.world.get_room(&conn.player.room_id) {
             Some(r) => r,
             None => return simple("Void\r\n"),
         };
         let low = target.to_lowercase();
-            let pname = &conn.player.name;
         let found = room.npcs.iter().find(|nid| {
             if let Some(npc) = st.world.get_npc(nid) {
-                    if !npc.name.to_lowercase().contains(&low) {
+                npc.name.to_lowercase().contains(&low) && npc.combat.is_some()
-                        return false;
-                    }
-                    let att = st.npc_attitude_toward(nid, pname);
-                    att.can_be_attacked() && npc.combat.is_some()
             } else {
                 false
             }
@@ -850,68 +948,77 @@ async fn cmd_attack(pid: usize, target: &str, state: &SharedState) -> CommandRes
                 ))
             }
         }
-        }
     };
 
-    if st
+    let npc_name = st
-        .players
+        .world
-        .get(&pid)
+        .get_npc(&npc_id)
-        .map(|c| c.combat.is_none())
+        .map(|n| n.name.clone())
-        .unwrap_or(false)
+        .unwrap_or_default();
-    {
-        if let Some(c) = st.players.get_mut(&pid) {
-            c.combat = Some(CombatState {
-                npc_id: npc_id.clone(),
-            });
-        }
-    }
 
-    st.check_respawns();
+    // Attitude penalty for attacking non-hostile NPCs
-
+    let pname = st
-    let player_name = st
         .players
         .get(&pid)
         .map(|c| c.player.name.clone())
         .unwrap_or_default();
-    let result = combat::do_attack(pid, &npc_id, &mut st);
+    let att = st.npc_attitude_toward(&npc_id, &pname);
-
+    let mut extra_msg = String::new();
-    match result {
+    if !att.is_hostile() {
-        Some(round) => {
+        st.shift_attitude(&npc_id, &pname, -30);
-            let mut out = round.output;
-            if round.npc_died {
-                st.shift_attitude(&npc_id, &player_name, -10);
         if let Some(faction) = st.world.get_npc(&npc_id).and_then(|n| n.faction.clone()) {
-                    st.shift_faction_attitude(&faction, &player_name, -5);
+            st.shift_faction_attitude(&faction, &pname, -15);
         }
-                if let Some(msg) = st.check_level_up(pid) {
+        extra_msg = format!(
-                    out.push_str(&format!(
+            "{}\r\n",
-                        "\r\n  {} {}\r\n",
+            ansi::color(ansi::RED, "  The locals look on in horror as you attack without provocation!")
-                        ansi::color(ansi::GREEN, "***"),
+        );
-                        ansi::bold(&msg)
-                    ));
     }
+
+    if let Some(c) = st.players.get_mut(&pid) {
+        c.combat = Some(CombatState {
+            npc_id: npc_id.clone(),
+            action: Some(CombatAction::Attack),
+            defending: false,
+        });
     }
-            if round.player_died {
+
-                out.push_str(&combat::player_death_respawn(pid, &mut st));
-                let rid = st
-                    .players
-                    .get(&pid)
-                    .map(|c| c.player.room_id.clone())
-                    .unwrap_or_default();
-                out.push_str(&render_room_view(&rid, pid, &st));
-            }
-            st.save_player_to_db(pid);
     CommandResult {
-                output: out,
+        output: format!(
+            "{}\r\n{}\r\n{}",
+            ansi::system_msg(&format!("You engage {} in combat!", npc_name)),
+            ansi::system_msg("Your attack will resolve on the next tick. Use 'attack', 'defend', 'flee', or 'use <item>'."),
+            extra_msg,
+        ),
         broadcasts: Vec::new(),
         kick_targets: Vec::new(),
         quit: false,
     }
-        }
+}
-        None => simple(&format!(
+
+async fn cmd_defend(pid: usize, state: &SharedState) -> CommandResult {
+    let mut st = state.lock().await;
+    let conn = match st.players.get_mut(&pid) {
+        Some(c) => c,
+        None => return simple("Error\r\n"),
+    };
+    if conn.combat.is_none() {
+        return simple(&format!(
             "{}\r\n",
-            ansi::error_msg("That target can't be attacked right now.")
+            ansi::error_msg("You're not in combat.")
-        )),
+        ));
+    }
+    if let Some(ref mut combat) = conn.combat {
+        combat.action = Some(CombatAction::Defend);
+    }
+    CommandResult {
+        output: format!(
+            "{}\r\n",
+            ansi::system_msg("You prepare to defend... (resolves next tick)")
+        ),
+        broadcasts: Vec::new(),
+        kick_targets: Vec::new(),
+        quit: false,
     }
 }
 
@@ -927,11 +1034,13 @@ async fn cmd_flee(pid: usize, state: &SharedState) -> CommandResult {
             ansi::error_msg("You're not in combat.")
         ));
     }
-    conn.combat = None;
+    if let Some(ref mut combat) = conn.combat {
+        combat.action = Some(CombatAction::Flee);
+    }
     CommandResult {
         output: format!(
             "{}\r\n",
-            ansi::system_msg("You disengage and flee from combat!")
+            ansi::system_msg("You prepare to flee... (resolves next tick)")
         ),
         broadcasts: Vec::new(),
         kick_targets: Vec::new(),
@@ -1011,6 +1120,35 @@ async fn cmd_stats(pid: usize, state: &SharedState) -> CommandResult {
         s.xp,
         s.xp_to_next
     ));
+
+    // Show combat status
+    if let Some(ref combat) = conn.combat {
+        let npc_name = st
+            .world
+            .get_npc(&combat.npc_id)
+            .map(|n| n.name.clone())
+            .unwrap_or_else(|| "???".into());
+        out.push_str(&format!(
+            "  {} {}\r\n",
+            ansi::color(ansi::RED, "Combat:"),
+            ansi::color(ansi::RED, &npc_name)
+        ));
+    }
+
+    // Show active status effects
+    let effects = st.db.load_effects(&p.name);
+    if !effects.is_empty() {
+        out.push_str(&format!("  {}\r\n", ansi::color(ansi::DIM, "Effects:")));
+        for eff in &effects {
+            out.push_str(&format!(
+                "    {} (mag: {}, {} ticks left)\r\n",
+                ansi::color(ansi::MAGENTA, &eff.kind),
+                eff.magnitude,
+                eff.remaining_ticks,
+            ));
+        }
+    }
+
     if p.is_admin {
         out.push_str(&format!(
             "  {}\r\n",
@@ -1066,8 +1204,9 @@ async fn cmd_help(pid: usize, state: &SharedState) -> CommandResult {
         ("inventory, i", "View your inventory"),
         ("equip <item>", "Equip a weapon or armor"),
         ("use <item>", "Use a consumable item"),
-        ("attack <target>, a", "Attack a hostile NPC"),
+        ("attack <target>, a", "Engage/attack a hostile NPC (tick-based)"),
-        ("flee", "Disengage from combat"),
+        ("defend, def", "Defend next tick (reduces incoming damage)"),
+        ("flee", "Attempt to flee combat (tick-based)"),
         ("stats, st", "View your character stats"),
         ("help, h, ?", "Show this help"),
         ("quit, exit", "Leave the game"),

src/db.rs

@@ -24,6 +24,13 @@ pub struct NpcAttitudeRow {
     pub value: i32,
 }
 
+pub struct StatusEffectRow {
+    pub player_name: String,
+    pub kind: String,
+    pub remaining_ticks: i32,
+    pub magnitude: i32,
+}
+
 pub trait GameDb: Send + Sync {
     fn load_player(&self, name: &str) -> Option<SavedPlayer>;
     fn save_player(&self, player: &SavedPlayer);
@@ -38,6 +45,12 @@ pub trait GameDb: Send + Sync {
     fn get_setting(&self, key: &str) -> Option<String>;
     fn set_setting(&self, key: &str, value: &str);
     fn list_settings(&self) -> Vec<(String, String)>;
+
+    fn load_effects(&self, player_name: &str) -> Vec<StatusEffectRow>;
+    fn save_effect(&self, player_name: &str, kind: &str, remaining_ticks: i32, magnitude: i32);
+    fn load_all_effects(&self) -> Vec<StatusEffectRow>;
+    fn tick_all_effects(&self) -> Vec<StatusEffectRow>;
+    fn clear_effects(&self, player_name: &str);
 }
 
 // --- SQLite implementation ---
@@ -82,6 +95,14 @@ impl SqliteDb {
             CREATE TABLE IF NOT EXISTS server_settings (
                 key TEXT PRIMARY KEY,
                 value TEXT NOT NULL
+            );
+
+            CREATE TABLE IF NOT EXISTS status_effects (
+                player_name TEXT NOT NULL,
+                kind TEXT NOT NULL,
+                remaining_ticks INTEGER NOT NULL,
+                magnitude INTEGER NOT NULL DEFAULT 0,
+                PRIMARY KEY (player_name, kind)
             );",
         )
         .map_err(|e| format!("Failed to create tables: {e}"))?;
@@ -93,7 +114,10 @@ impl SqliteDb {
             .map(|c| c > 0)
             .unwrap_or(false);
         if !has_admin {
-            let _ = conn.execute("ALTER TABLE players ADD COLUMN is_admin INTEGER NOT NULL DEFAULT 0", []);
+            let _ = conn.execute(
+                "ALTER TABLE players ADD COLUMN is_admin INTEGER NOT NULL DEFAULT 0",
+                [],
+            );
         }
 
         log::info!("Database opened: {}", path.display());
@@ -149,9 +173,19 @@ impl GameDb for SqliteDb {
                 equipped_armor_json=excluded.equipped_armor_json,
                 is_admin=excluded.is_admin",
             rusqlite::params![
-                p.name, p.race_id, p.class_id, p.room_id, p.level, p.xp,
+                p.name,
-                p.hp, p.max_hp, p.attack, p.defense, p.inventory_json,
+                p.race_id,
-                p.equipped_weapon_json, p.equipped_armor_json,
+                p.class_id,
+                p.room_id,
+                p.level,
+                p.xp,
+                p.hp,
+                p.max_hp,
+                p.attack,
+                p.defense,
+                p.inventory_json,
+                p.equipped_weapon_json,
+                p.equipped_armor_json,
                 p.is_admin as i32,
             ],
         );
@@ -161,6 +195,7 @@ impl GameDb for SqliteDb {
         let conn = self.conn.lock().unwrap();
         let _ = conn.execute("DELETE FROM players WHERE name = ?1", [name]);
         let _ = conn.execute("DELETE FROM npc_attitudes WHERE player_name = ?1", [name]);
+        let _ = conn.execute("DELETE FROM status_effects WHERE player_name = ?1", [name]);
     }
 
     fn set_admin(&self, name: &str, is_admin: bool) -> bool {
@@ -272,4 +307,76 @@ impl GameDb for SqliteDb {
             .filter_map(|r| r.ok())
             .collect()
     }
+
+    fn load_effects(&self, player_name: &str) -> Vec<StatusEffectRow> {
+        let conn = self.conn.lock().unwrap();
+        let mut stmt = conn
+            .prepare("SELECT player_name, kind, remaining_ticks, magnitude FROM status_effects WHERE player_name = ?1 AND remaining_ticks > 0")
+            .unwrap();
+        stmt.query_map([player_name], |row| {
+            Ok(StatusEffectRow {
+                player_name: row.get(0)?,
+                kind: row.get(1)?,
+                remaining_ticks: row.get(2)?,
+                magnitude: row.get(3)?,
+            })
+        })
+        .unwrap()
+        .filter_map(|r| r.ok())
+        .collect()
+    }
+
+    fn save_effect(&self, player_name: &str, kind: &str, remaining_ticks: i32, magnitude: i32) {
+        let conn = self.conn.lock().unwrap();
+        let _ = conn.execute(
+            "INSERT INTO status_effects (player_name, kind, remaining_ticks, magnitude)
+             VALUES (?1, ?2, ?3, ?4)
+             ON CONFLICT(player_name, kind) DO UPDATE SET remaining_ticks=excluded.remaining_ticks, magnitude=excluded.magnitude",
+            rusqlite::params![player_name, kind, remaining_ticks, magnitude],
+        );
+    }
+
+    fn load_all_effects(&self) -> Vec<StatusEffectRow> {
+        let conn = self.conn.lock().unwrap();
+        let mut stmt = conn
+            .prepare("SELECT player_name, kind, remaining_ticks, magnitude FROM status_effects WHERE remaining_ticks > 0")
+            .unwrap();
+        stmt.query_map([], |row| {
+            Ok(StatusEffectRow {
+                player_name: row.get(0)?,
+                kind: row.get(1)?,
+                remaining_ticks: row.get(2)?,
+                magnitude: row.get(3)?,
+            })
+        })
+        .unwrap()
+        .filter_map(|r| r.ok())
+        .collect()
+    }
+
+    fn tick_all_effects(&self) -> Vec<StatusEffectRow> {
+        let conn = self.conn.lock().unwrap();
+        let _ = conn.execute("UPDATE status_effects SET remaining_ticks = remaining_ticks - 1 WHERE remaining_ticks > 0", []);
+        let mut stmt = conn
+            .prepare("SELECT player_name, kind, remaining_ticks, magnitude FROM status_effects WHERE remaining_ticks >= 0")
+            .unwrap();
+        let effects: Vec<StatusEffectRow> = stmt.query_map([], |row| {
+            Ok(StatusEffectRow {
+                player_name: row.get(0)?,
+                kind: row.get(1)?,
+                remaining_ticks: row.get(2)?,
+                magnitude: row.get(3)?,
+            })
+        })
+        .unwrap()
+        .filter_map(|r| r.ok())
+        .collect();
+        let _ = conn.execute("DELETE FROM status_effects WHERE remaining_ticks <= 0", []);
+        effects
+    }
+
+    fn clear_effects(&self, player_name: &str) {
+        let conn = self.conn.lock().unwrap();
+        let _ = conn.execute("DELETE FROM status_effects WHERE player_name = ?1", [player_name]);
+    }
 }

src/game.rs

@@ -52,8 +52,18 @@ impl Player {
     }
 }
 
+#[derive(Debug, Clone)]
+pub enum CombatAction {
+    Attack,
+    Defend,
+    Flee,
+    UseItem(usize),
+}
+
 pub struct CombatState {
     pub npc_id: String,
+    pub action: Option<CombatAction>,
+    pub defending: bool,
 }
 
 pub struct NpcInstance {
@@ -69,11 +79,42 @@ pub struct PlayerConnection {
     pub combat: Option<CombatState>,
 }
 
+pub struct XorShift64 {
+    state: u64,
+}
+
+impl XorShift64 {
+    pub fn new(seed: u64) -> Self {
+        XorShift64 {
+            state: if seed == 0 { 0xdeadbeefcafe1234 } else { seed },
+        }
+    }
+
+    pub fn next(&mut self) -> u64 {
+        let mut x = self.state;
+        x ^= x << 13;
+        x ^= x >> 7;
+        x ^= x << 17;
+        self.state = x;
+        x
+    }
+
+    pub fn next_range(&mut self, min: i32, max: i32) -> i32 {
+        if min >= max {
+            return min;
+        }
+        let range = (max - min + 1) as u64;
+        (self.next() % range) as i32 + min
+    }
+}
+
 pub struct GameState {
     pub world: World,
     pub db: Arc<dyn GameDb>,
     pub players: HashMap<usize, PlayerConnection>,
     pub npc_instances: HashMap<String, NpcInstance>,
+    pub rng: XorShift64,
+    pub tick_count: u64,
 }
 
 pub type SharedState = Arc<Mutex<GameState>>;
@@ -93,11 +134,17 @@ impl GameState {
                 );
             }
         }
+        let seed = std::time::SystemTime::now()
+            .duration_since(std::time::UNIX_EPOCH)
+            .unwrap_or_default()
+            .as_nanos() as u64;
         GameState {
             world,
             db,
             players: HashMap::new(),
             npc_instances,
+            rng: XorShift64::new(seed),
+            tick_count: 0,
         }
     }
 

src/lib.rs

@@ -6,4 +6,5 @@ pub mod commands;
 pub mod db;
 pub mod game;
 pub mod ssh;
+pub mod tick;
 pub mod world;

src/main.rs

@@ -9,6 +9,7 @@ use tokio::net::TcpListener;
 use mudserver::db;
 use mudserver::game;
 use mudserver::ssh;
+use mudserver::tick;
 use mudserver::world;
 
 const DEFAULT_PORT: u16 = 2222;
@@ -82,6 +83,13 @@ async fn main() {
     let config = Arc::new(config);
 
     let state = Arc::new(Mutex::new(game::GameState::new(loaded_world, db)));
+
+    // Spawn tick engine
+    let tick_state = state.clone();
+    tokio::spawn(async move {
+        tick::run_tick_engine(tick_state).await;
+    });
+
     let mut server = ssh::MudServer::new(state);
 
     let listener = TcpListener::bind(("0.0.0.0", port)).await.unwrap();

src/tick.rs

@@ -0,0 +1,281 @@
+use std::collections::HashMap;
+use std::time::Duration;
+
+use russh::CryptoVec;
+
+use crate::ansi;
+use crate::combat;
+use crate::commands::render_room_view;
+use crate::game::SharedState;
+
+const TICK_INTERVAL_MS: u64 = 3000;
+const REGEN_EVERY_N_TICKS: u64 = 5;
+const REGEN_PERCENT: i32 = 5;
+
+pub async fn run_tick_engine(state: SharedState) {
+    log::info!(
+        "Tick engine started (interval={}ms, regen every {} ticks)",
+        TICK_INTERVAL_MS,
+        REGEN_EVERY_N_TICKS,
+    );
+
+    loop {
+        tokio::time::sleep(Duration::from_millis(TICK_INTERVAL_MS)).await;
+
+        let mut st = state.lock().await;
+        st.tick_count += 1;
+        let tick = st.tick_count;
+
+        st.check_respawns();
+
+        // --- NPC auto-aggro: hostile NPCs initiate combat with players in their room ---
+        let mut new_combats: Vec<(usize, String)> = Vec::new();
+        for (pid, conn) in st.players.iter() {
+            if conn.combat.is_some() {
+                continue;
+            }
+            let room = match st.world.get_room(&conn.player.room_id) {
+                Some(r) => r,
+                None => continue,
+            };
+            for npc_id in &room.npcs {
+                let npc = match st.world.get_npc(npc_id) {
+                    Some(n) => n,
+                    None => continue,
+                };
+                if npc.combat.is_none() {
+                    continue;
+                }
+                let alive = st.npc_instances.get(npc_id).map(|i| i.alive).unwrap_or(false);
+                if !alive {
+                    continue;
+                }
+                let att = st.npc_attitude_toward(npc_id, &conn.player.name);
+                if att.will_attack() {
+                    new_combats.push((*pid, npc_id.clone()));
+                    break;
+                }
+            }
+        }
+
+        let mut messages: HashMap<usize, String> = HashMap::new();
+
+        for (pid, npc_id) in &new_combats {
+            let npc_name = st
+                .world
+                .get_npc(npc_id)
+                .map(|n| n.name.clone())
+                .unwrap_or_default();
+
+            if let Some(conn) = st.players.get_mut(pid) {
+                if conn.combat.is_none() {
+                    conn.combat = Some(crate::game::CombatState {
+                        npc_id: npc_id.clone(),
+                        action: None,
+                        defending: false,
+                    });
+                    messages.entry(*pid).or_default().push_str(&format!(
+                        "\r\n  {} {} attacks you!\r\n",
+                        ansi::color(ansi::RED, "!!"),
+                        ansi::color(ansi::RED, &npc_name),
+                    ));
+                }
+            }
+        }
+
+        // --- Resolve combat for all players in combat ---
+        let combat_players: Vec<usize> = st
+            .players
+            .iter()
+            .filter(|(_, c)| c.combat.is_some())
+            .map(|(&id, _)| id)
+            .collect();
+
+        for pid in combat_players {
+            if let Some(round) = combat::resolve_combat_tick(pid, &mut st) {
+                messages.entry(pid).or_default().push_str(&round.output);
+
+                if round.npc_died {
+                    let npc_id = {
+                        // NPC is dead, combat was cleared in resolve_combat_tick
+                        // Get the npc_id from the round context
+                        // We need to find which NPC just died - check npc_instances
+                        // Actually let's track it differently: get it before combat resolution
+                        String::new()
+                    };
+                    // We handle attitude shifts and level-ups after resolve
+                    // The npc_id is already gone from combat state, so we need another approach
+                    // Let's get player name and check level up
+                    if let Some(msg) = st.check_level_up(pid) {
+                        messages.entry(pid).or_default().push_str(&format!(
+                            "\r\n  {} {}\r\n",
+                            ansi::color(ansi::GREEN, "***"),
+                            ansi::bold(&msg),
+                        ));
+                    }
+                    let _ = npc_id;
+                }
+
+                if round.player_died {
+                    let death_msg = combat::player_death_respawn(pid, &mut st);
+                    messages.entry(pid).or_default().push_str(&death_msg);
+                    let rid = st
+                        .players
+                        .get(&pid)
+                        .map(|c| c.player.room_id.clone())
+                        .unwrap_or_default();
+                    if !rid.is_empty() {
+                        messages
+                            .entry(pid)
+                            .or_default()
+                            .push_str(&render_room_view(&rid, pid, &st));
+                    }
+                }
+
+                st.save_player_to_db(pid);
+            }
+        }
+
+        // --- Process status effects (ticks down ALL effects in DB, including offline players) ---
+        let active_effects = st.db.tick_all_effects();
+        for eff in &active_effects {
+            match eff.kind.as_str() {
+                "poison" => {
+                    let dmg = eff.magnitude;
+                    let online_pid = st
+                        .players
+                        .iter()
+                        .find(|(_, c)| c.player.name == eff.player_name)
+                        .map(|(&id, _)| id);
+
+                    if let Some(pid) = online_pid {
+                        if let Some(conn) = st.players.get_mut(&pid) {
+                            conn.player.stats.hp = (conn.player.stats.hp - dmg).max(0);
+                            if eff.remaining_ticks > 0 {
+                                messages.entry(pid).or_default().push_str(&format!(
+                                    "\r\n  {} Poison deals {} damage! ({} ticks left)\r\n",
+                                    ansi::color(ansi::GREEN, "~*"),
+                                    dmg,
+                                    eff.remaining_ticks,
+                                ));
+                            } else {
+                                messages.entry(pid).or_default().push_str(&format!(
+                                    "\r\n  {} The poison wears off.\r\n",
+                                    ansi::color(ansi::GREEN, "~*"),
+                                ));
+                            }
+                            if conn.player.stats.hp <= 0 {
+                                let death_msg = combat::player_death_respawn(pid, &mut st);
+                                messages.entry(pid).or_default().push_str(&death_msg);
+                            }
+                        }
+                        st.save_player_to_db(pid);
+                    } else {
+                        // Offline player: apply damage directly to DB
+                        if let Some(mut saved) = st.db.load_player(&eff.player_name) {
+                            saved.hp = (saved.hp - dmg).max(0);
+                            if saved.hp <= 0 {
+                                saved.hp = saved.max_hp;
+                                saved.room_id = st.spawn_room().to_string();
+                                st.db.clear_effects(&eff.player_name);
+                            }
+                            st.db.save_player(&saved);
+                        }
+                    }
+                }
+                "regen" => {
+                    let heal = eff.magnitude;
+                    let online_pid = st
+                        .players
+                        .iter()
+                        .find(|(_, c)| c.player.name == eff.player_name)
+                        .map(|(&id, _)| id);
+
+                    if let Some(pid) = online_pid {
+                        if let Some(conn) = st.players.get_mut(&pid) {
+                            let old = conn.player.stats.hp;
+                            conn.player.stats.hp =
+                                (conn.player.stats.hp + heal).min(conn.player.stats.max_hp);
+                            let healed = conn.player.stats.hp - old;
+                            if healed > 0 && eff.remaining_ticks > 0 {
+                                messages.entry(pid).or_default().push_str(&format!(
+                                    "\r\n  {} Regeneration heals {} HP.\r\n",
+                                    ansi::color(ansi::GREEN, "++"),
+                                    healed,
+                                ));
+                            }
+                            if eff.remaining_ticks <= 0 {
+                                messages.entry(pid).or_default().push_str(&format!(
+                                    "\r\n  {} The regeneration effect fades.\r\n",
+                                    ansi::color(ansi::DIM, "~~"),
+                                ));
+                            }
+                        }
+                        st.save_player_to_db(pid);
+                    } else {
+                        if let Some(mut saved) = st.db.load_player(&eff.player_name) {
+                            saved.hp = (saved.hp + heal).min(saved.max_hp);
+                            st.db.save_player(&saved);
+                        }
+                    }
+                }
+                _ => {}
+            }
+        }
+
+        // --- Passive regen for online players not in combat ---
+        if tick % REGEN_EVERY_N_TICKS == 0 {
+            let regen_pids: Vec<usize> = st
+                .players
+                .iter()
+                .filter(|(_, c)| {
+                    c.combat.is_none() && c.player.stats.hp < c.player.stats.max_hp
+                })
+                .map(|(&id, _)| id)
+                .collect();
+
+            for pid in regen_pids {
+                if let Some(conn) = st.players.get_mut(&pid) {
+                    let heal =
+                        (conn.player.stats.max_hp * REGEN_PERCENT / 100).max(1);
+                    let old = conn.player.stats.hp;
+                    conn.player.stats.hp =
+                        (conn.player.stats.hp + heal).min(conn.player.stats.max_hp);
+                    let healed = conn.player.stats.hp - old;
+                    if healed > 0 {
+                        messages.entry(pid).or_default().push_str(&format!(
+                            "\r\n  {} You recover {} HP. ({}/{})\r\n",
+                            ansi::color(ansi::DIM, "~~"),
+                            healed,
+                            conn.player.stats.hp,
+                            conn.player.stats.max_hp,
+                        ));
+                    }
+                }
+                st.save_player_to_db(pid);
+            }
+        }
+
+        // --- Send accumulated messages to online players ---
+        let sends: Vec<(russh::ChannelId, russh::server::Handle, String)> = messages
+            .into_iter()
+            .filter_map(|(pid, msg)| {
+                if msg.is_empty() {
+                    return None;
+                }
+                let conn = st.players.get(&pid)?;
+                Some((
+                    conn.channel,
+                    conn.handle.clone(),
+                    format!("{}{}", msg, ansi::prompt()),
+                ))
+            })
+            .collect();
+
+        drop(st);
+
+        for (ch, handle, text) in sends {
+            let _ = handle.data(ch, CryptoVec::from(text.as_bytes())).await;
+        }
+    }
+}

src/world.rs

@@ -49,7 +49,7 @@ impl Attitude {
         matches!(self, Attitude::Hostile)
     }
 
-    pub fn can_be_attacked(self) -> bool {
+    pub fn is_hostile(self) -> bool {
         matches!(self, Attitude::Hostile | Attitude::Aggressive)
     }
 
@@ -315,7 +315,8 @@ impl World {
 
             load_entities_from_dir(&region_path.join("npcs"), &region_name, &mut |id, content| {
                 let nf: NpcFile = toml::from_str(content).map_err(|e| format!("Bad npc {id}: {e}"))?;
-                let combat = nf.combat.map(|c| NpcCombatStats { max_hp: c.max_hp, attack: c.attack, defense: c.defense, xp_reward: c.xp_reward });
+                let combat = Some(nf.combat.map(|c| NpcCombatStats { max_hp: c.max_hp, attack: c.attack, defense: c.defense, xp_reward: c.xp_reward })
+                    .unwrap_or(NpcCombatStats { max_hp: 20, attack: 4, defense: 2, xp_reward: 5 }));
                 let greeting = nf.dialogue.and_then(|d| d.greeting);
                 npcs.insert(id.clone(), Npc { id: id.clone(), name: nf.name, description: nf.description, room: nf.room, base_attitude: nf.base_attitude, faction: nf.faction, respawn_secs: nf.respawn_secs, greeting, combat });
                 Ok(())