Combat Constants Reference

All combat constants are defined in packages/shared/src/constants/CombatConstants.ts.

Attack Ranges

export const COMBAT_CONSTANTS = {
  // Ranges (tiles)
  RANGED_RANGE: 10,              // Maximum ranged attack distance
  MAGIC_RANGE: 10,               // Maximum magic attack distance
  MELEE_RANGE_STANDARD: 1,       // Standard melee (cardinal only)
  MELEE_RANGE_HALBERD: 2,        // Halberd/spear (includes diagonal)
  PICKUP_RANGE: 2.5,             // Item pickup range
};

Tick System

export const COMBAT_CONSTANTS = {
  // Tick timing (OSRS-accurate)
  TICK_DURATION_MS: 600,         // 0.6 seconds per tick
  
  // Attack speeds (ticks)
  DEFAULT_ATTACK_SPEED_TICKS: 4, // 2.4 seconds (standard sword)
  
  // Combat timing
  COMBAT_TIMEOUT_TICKS: 17,      // 10.2 seconds out of combat
  LOGOUT_PREVENTION_TICKS: 16,   // 9.6 seconds after damage
  HEALTH_REGEN_COOLDOWN_TICKS: 17, // 10.2 seconds after damage
  HEALTH_REGEN_INTERVAL_TICKS: 100, // 60 seconds between regen
  AFK_DISABLE_RETALIATE_TICKS: 2000, // 20 minutes AFK threshold
};

Food Consumption

export const COMBAT_CONSTANTS = {
  // Food consumption (OSRS-accurate)
  EAT_DELAY_TICKS: 3,            // 1.8 seconds between foods
  EAT_ATTACK_DELAY_TICKS: 3,     // Added to attack cooldown when eating mid-combat
  MAX_HEAL_AMOUNT: 99,           // Security cap on healing
};

Projectile Launch Delays

export const COMBAT_CONSTANTS = {
  // Projectile launch delays (ms)
  SPELL_LAUNCH_DELAY_MS: 600,    // Delay before spell projectile spawns (cast animation)
  ARROW_LAUNCH_DELAY_MS: 400,    // Delay before arrow projectile spawns (draw animation)
};

Purpose:

Allows attack animation wind-up before projectile appears
Spell: 600ms for staff raise and cast gesture
Arrow: 400ms for bow draw animation
Visual projectile arrival coincides with server-side damage splat

Hit Delay Formulas

export const COMBAT_CONSTANTS = {
  HIT_DELAY: {
    // Melee
    MELEE_BASE: 0,               // Immediate hit
    
    // Ranged: 1 + floor((3 + distance) / 6)
    RANGED_BASE: 1,
    RANGED_DISTANCE_OFFSET: 3,
    RANGED_DISTANCE_DIVISOR: 6,
    
    // Magic: 1 + floor((1 + distance) / 3)
    MAGIC_BASE: 1,
    MAGIC_DISTANCE_OFFSET: 1,
    MAGIC_DISTANCE_DIVISOR: 3,
    
    MAX_HIT_DELAY: 10,           // Cap at 10 ticks
  },
};

Hit Delay Examples:

Attack Type	Distance	Delay (ticks)	Delay (seconds)
Melee	Any	0	0.0s
Ranged	1	1	0.6s
Ranged	5	2	1.2s
Ranged	10	3	1.8s
Magic	1	1	0.6s
Magic	5	3	1.8s
Magic	10	4	2.4s

Damage Formulas

export const COMBAT_CONSTANTS = {
  // Damage calculation constants
  BASE_CONSTANT: 64,
  EFFECTIVE_LEVEL_CONSTANT: 8,
  DAMAGE_DIVISOR: 640,
  MIN_DAMAGE: 0,
  MAX_DAMAGE: 200,
};

Max Hit Formula:

maxHit = floor(0.5 + (effectiveStrength × (strengthBonus + 64)) / 640)

Effective Level Formula:

effectiveLevel = (baseLevel × prayerMultiplier) + 8 + styleBonus

XP Rates

export const COMBAT_CONSTANTS = {
  XP: {
    COMBAT_XP_PER_DAMAGE: 4,          // 4 XP per damage for main skill
    HITPOINTS_XP_PER_DAMAGE: 1.33,    // 1.33 XP for Constitution
    CONTROLLED_XP_PER_DAMAGE: 1.33,   // Split across all combat skills
  },
};

Visual Rotation

export const COMBAT_CONSTANTS = {
  ROTATION: {
    // Combat facing slerp speed — ~95% convergence in 150ms
    COMBAT_SLERP_SPEED: 20.0,
    
    // Movement facing slerp speed — ~90% convergence in 200ms
    MOVEMENT_SLERP_SPEED: 12.0,
    
    // Max distance (tiles) to resolve a combat facing target
    FACING_MAX_DISTANCE: 20,
    
    // Min squared distance (tiles²) to rotate toward target
    // Prevents flips when overlapping (0.5² = half-tile)
    MIN_ROTATION_DISTANCE_SQ: 0.25,
  },
};

Animation

export const COMBAT_CONSTANTS = {
  ANIMATION: {
    HIT_FRAME_RATIO: 0.5,          // Damage applies at 50% through animation
    MIN_ANIMATION_TICKS: 2,        // Minimum animation duration
    HITSPLAT_DELAY_TICKS: 0,       // Hitsplat shows immediately on hit
    HITSPLAT_DURATION_TICKS: 2,    // Hitsplat visible for 1.2 seconds
    EMOTE_COMBAT: "combat",
    EMOTE_SWORD_SWING: "sword_swing",
    EMOTE_RANGED: "ranged",
    EMOTE_MAGIC: "magic",
    EMOTE_IDLE: "idle",
    CROSSFADE_DURATION: 0.35,      // 350ms animation crossfade (RS3-style)
  },
};

Death & Loot

export const COMBAT_CONSTANTS = {
  // Death & loot (ticks)
  RESPAWN_TICKS_RANDOMNESS: 8,
  GRAVESTONE_TICKS: 1500,          // 15 minutes
  GROUND_ITEM_DESPAWN_TICKS: 6000, // 60 minutes (OSRS-accurate)
  UNTRADEABLE_DESPAWN_TICKS: 6000, // 60 minutes (OSRS-accurate)
  LOOT_PROTECTION_TICKS: 100,      // 1 minute killer protection
  CORPSE_DESPAWN_TICKS: 200,       // 2 minutes
  
  DEATH: {
    ANIMATION_TICKS: 7,            // 4.2 seconds death animation
    COOLDOWN_TICKS: 17,            // 10.2 seconds between deaths
    RECONNECT_RESPAWN_DELAY_TICKS: 1,
    STALE_LOCK_AGE_TICKS: 3000,    // 30 minutes stale lock cleanup
    DEFAULT_RESPAWN_POSITION: { x: 0, y: 0, z: 0 } as const,
    DEFAULT_RESPAWN_TOWN: "Central Haven",
  } as const,
};

Manifest Defaults

export const COMBAT_CONSTANTS = {
  DEFAULTS: {
    NPC: {
      ATTACK_SPEED_TICKS: 4,
      AGGRO_RANGE: 4,
      COMBAT_RANGE: 1,
      LEASH_RANGE: 42,             // Extended from OSRS default of 7
      RESPAWN_TICKS: 25,
      WANDER_RADIUS: 5,
    },
    ITEM: {
      ATTACK_SPEED: 4,
      ATTACK_RANGE: 1,
    },
  } as const,
};

Aggro Constants

export const AGGRO_CONSTANTS = {
  DEFAULT_BEHAVIOR: "passive" as const,
  AGGRO_UPDATE_INTERVAL_MS: 100,
  ALWAYS_AGGRESSIVE_LEVEL: 999,  // Level threshold for always_aggressive
};

Level Constants

export const LEVEL_CONSTANTS = {
  DEFAULT_COMBAT_LEVEL: 3,
  MIN_COMBAT_LEVEL: 3,
  MAX_LEVEL: 99,
  
  XP_BASE: 50,
  XP_GROWTH_FACTOR: 8,
  
  COMBAT_LEVEL_WEIGHTS: {
    DEFENSE_WEIGHT: 0.25,
    OFFENSE_WEIGHT: 0.325,
    RANGED_MULTIPLIER: 1.5,
  },
};

Combat Styles

Ranged Style Bonuses

export const RANGED_STYLE_BONUSES = {
  accurate: {
    attackBonus: 3,
    speedModifier: 0,
    rangeModifier: 0,
    xpSplit: "ranged" as const,
  },
  rapid: {
    attackBonus: 0,
    speedModifier: -1,           // 1 tick faster
    rangeModifier: 0,
    xpSplit: "ranged" as const,
  },
  longrange: {
    attackBonus: 0,
    speedModifier: 0,
    rangeModifier: 2,            // +2 tile range
    xpSplit: "ranged_defence" as const,
  },
};

Magic Style Bonuses

export const MAGIC_STYLE_BONUSES = {
  accurate: {
    attackBonus: 3,
    speedModifier: 0,
    rangeModifier: 0,
    xpSplit: "magic" as const,
  },
  longrange: {
    attackBonus: 1,
    speedModifier: 0,
    rangeModifier: 2,            // +2 tile range
    xpSplit: "magic_defence" as const,
  },
  autocast: {
    attackBonus: 0,
    speedModifier: 0,
    rangeModifier: 0,
    xpSplit: "magic" as const,
  },
};

Usage Examples

Check Attack Range

import { COMBAT_CONSTANTS } from "@hyperscape/shared";

const distance = tileChebyshevDistance(attackerTile, targetTile);
const inRange = distance <= COMBAT_CONSTANTS.RANGED_RANGE && distance > 0;

Calculate Hit Delay

const { HIT_DELAY, TICK_DURATION_MS } = COMBAT_CONSTANTS;

// Ranged hit delay
const rangedHitDelayTicks = Math.min(
  HIT_DELAY.MAX_HIT_DELAY,
  HIT_DELAY.RANGED_BASE + Math.floor((HIT_DELAY.RANGED_DISTANCE_OFFSET + distance) / HIT_DELAY.RANGED_DISTANCE_DIVISOR),
);

// Magic hit delay
const magicHitDelayTicks = Math.min(
  HIT_DELAY.MAX_HIT_DELAY,
  HIT_DELAY.MAGIC_BASE + Math.floor((HIT_DELAY.MAGIC_DISTANCE_OFFSET + distance) / HIT_DELAY.MAGIC_DISTANCE_DIVISOR),
);

Calculate Projectile Travel Time

// Spell projectile
const spellLaunchDelayMs = COMBAT_CONSTANTS.SPELL_LAUNCH_DELAY_MS;
const travelDurationMs = Math.max(
  200,
  magicHitDelayTicks * COMBAT_CONSTANTS.TICK_DURATION_MS - spellLaunchDelayMs,
);

// Arrow projectile
const arrowLaunchDelayMs = COMBAT_CONSTANTS.ARROW_LAUNCH_DELAY_MS;
const travelDurationMs = Math.max(
  200,
  rangedHitDelayTicks * COMBAT_CONSTANTS.TICK_DURATION_MS - arrowLaunchDelayMs,
);

Check Combat Timeout

const ticksSinceLastHit = currentTick - lastAttackTick;
const combatEnded = ticksSinceLastHit >= COMBAT_CONSTANTS.COMBAT_TIMEOUT_TICKS;

Calculate Retaliation Delay

// OSRS-accurate: ceil(attackSpeed / 2) + 1 ticks
const retaliationDelay = Math.ceil(attackSpeedTicks / 2) + 1;

Overview

Engine Architecture

Client Application

Game Systems

AI Agents

Data Manifests

Technical Reference

Combat Constants Reference

Combat Constants Reference

Attack Ranges

Tick System

Food Consumption

Projectile Launch Delays

Hit Delay Formulas

Damage Formulas

XP Rates

Visual Rotation

Animation

Death & Loot

Manifest Defaults

Aggro Constants

Level Constants

Combat Styles

Ranged Style Bonuses

Magic Style Bonuses

Usage Examples

Check Attack Range

Calculate Hit Delay

Calculate Projectile Travel Time

Check Combat Timeout

Calculate Retaliation Delay

Overview

Engine Architecture

Client Application

Game Systems

AI Agents

Data Manifests

Technical Reference

​Combat Constants Reference

​Attack Ranges

​Tick System

​Food Consumption

​Projectile Launch Delays

​Hit Delay Formulas

​Damage Formulas

​XP Rates

​Visual Rotation

​Animation

​Death & Loot

​Manifest Defaults

​Aggro Constants

​Level Constants

​Combat Styles

​Ranged Style Bonuses

​Magic Style Bonuses

​Usage Examples

​Check Attack Range

​Calculate Hit Delay

​Calculate Projectile Travel Time

​Check Combat Timeout

​Calculate Retaliation Delay

​Related Documentation

Combat Constants Reference

Attack Ranges

Tick System

Food Consumption

Projectile Launch Delays

Hit Delay Formulas

Damage Formulas

XP Rates

Visual Rotation

Animation

Death & Loot

Manifest Defaults

Aggro Constants

Level Constants

Combat Styles

Ranged Style Bonuses

Magic Style Bonuses

Usage Examples

Check Attack Range

Calculate Hit Delay

Calculate Projectile Travel Time

Check Combat Timeout

Calculate Retaliation Delay

Related Documentation