Pet Mechanic allows the hero to tame and command mobs as permanent companions that fight alongside them.

Game Mechanic (AI/Pet System)

Pet Management: PetInventoryManager.java

• Package: `com.nyrds.pixeldungeon.items`
• Methods:
  • `hasPets(Hero hero)` - Check if hero has pets
  • `openPetInventoryFromToolbar(Hero hero)` - Open pet inventory UI
  • `giveToPet(Hero hero, Item item)` - Transfer item to pet
  • `takeFromPet(Pet pet, Item item)` - Take item from pet

Pet Base Class: Mob.java (pet functionality)

• Mobs become pets via `Mob.makePet(Hero hero)`
• Pet state tracked in `Mob.petMaster` field (hero ID)

Mob Pet Methods: Mob.java

• `makePet(Hero hero)` - Convert mob to pet
• `isPet()` - Check if mob is a pet
• `getPets_l()` - Get list of hero's pets (Lua)
• `canBePet()` - Check if mob species can be tamed

AI States: MobAi.java

• `ControlledAi` - Direct player control state
• `Hunting` - Pet follows and attacks enemies
• `Wandering` - Idle behavior near hero
• `Fleeing` - Low health retreat

UI: Toolbar.java

• Pet inventory button (index 10, tinted)
• Opens `WndPetInventory` window

Windows: WndPetItem.java

• Pet inventory management UI
• Actions: Give, Take, Equip, Unequip

Actions: CommonActions.java

• `AC_GIVE_TO_PET` - Give item to pet
• `AC_TAKE_FROM_PET` - Take item from pet

Mob Pet Property: In `mobsDesc/<Mob>.json`

{
  "canBePet": true,
  "name": "Rat_Name",
  ...
}

Mobs with `“canBePet”: true`:

• Rat, Snail, Crab, Bat, Spider, etc.
• Boss mobs: `false`
• Hostile NPCs: `false`

English (values/strings_all.xml):

<string name="PetInventory_Title">Pet Inventory</string>
<string name="PetInventory_ViewManage">View and manage your pet's equipment</string>
<string name="PetInventory_GiveToPet">Give to Pet</string>
<string name="PetInventory_TakeFromPet">Take from Pet</string>
<string name="PetInventory_GaveItem">You gave %s to your pet</string>
<string name="PetInventory_TookItem">You took %s from your pet</string>
<string name="PetInventory_GiveN">Give %d</string>
<string name="PetInventory_TakeN">Take %d</string>
<string name="PetInventory_PetBackpackFull">Pet's backpack is full</string>
<string name="PetInventory_HeroBackpackFull">Your backpack is full</string>
<string name="PetInventory_TooFar">Pet is too far away</string>
<string name="PetInventory_CantGiveEquipped">Can't give equipped items</string>
<string name="Mob_Cannot_Be_Pet">This creature cannot be tamed</string>
<string name="PetInventory_ACTakeFromPet">Take from Pet</string>
<string name="PetInventory_ACGiveToPet">Give to Pet</string>

Russian (values-ru/strings_all.xml):

<string name="PetInventory_Title">Инвентарь питомца</string>
<string name="PetInventory_ViewManage">Просмотр и управление экипировкой питомца</string>
<string name="PetInventory_GiveToPet">Отдать питомцу</string>
<string name="PetInventory_TakeFromPet">Забрать у питомца</string>
<string name="PetInventory_GaveItem">Вы отдали %s питомцу</string>
<string name="PetInventory_TookItem">Вы забрали %s у питомца</string>
<string name="PetInventory_GiveN">Отдать %d</string>
<string name="PetInventory_TakeN">Забрать %d</string>
<string name="PetInventory_PetBackpackFull">Рюкзак питомца полон</string>
<string name="PetInventory_HeroBackpackFull">Ваш рюкзак полон</string>
<string name="PetInventory_TooFar">Питомец слишком далеко</string>
<string name="PetInventory_CantGiveEquipped">Нельзя отдать экипированные предметы</string>
<string name="Mob_Cannot_Be_Pet">Это существо нельзя приручить</string>
<string name="PetInventory_ACTakeFromPet">Забрать у питомца</string>
<string name="PetInventory_ACGiveToPet">Отдать питомцу</string>

• Pet AI: `scripts/lib/commonClasses.lua` - `RPD.Mob:makePet(target, caster)`
• Possess Spell: `scripts/spells/Possess.lua` - Temporary pet control
• Raise Dead: `scripts/spells/RaiseDead.lua` - Undead pet creation
• Exhumation: `scripts/spells/Exhumation.lua` - Wraith pet creation
• Summon Beast: `scripts/spells/SummonBeast.lua` - Temporary summons

• Mob System - Base mob class with pet support
• Rat Mob - Tameable
• Snail Mob - Tameable
• Crab Mob - Tameable
• Bat Mob - Tameable
• Spider Mob - Tameable
• Possess Spell - Temporary control
• Raise Dead Spell - Undead pets
• Summon Beast Spell - Temporary summons

• Taming Methods:
  • Scroll of Taming / Wand of Taming
  • Possess Spell (temporary)
  • Summon Beast Spell (temporary)
  • Raise Dead (undead pets)
  • Exhumation (Wraith pets)
  • Certain items/artifacts
• Pet Capabilities:
  • Follow hero automatically
  • Attack enemies in range
  • Can equip items (weapons, armor, rings)
  • Have own inventory (accessible via toolbar)
  • Gain experience and level up
  • Can be healed with potions/spells
• Pet Limits:
  • Max 3 active pets (configurable)
  • Only mobs with `canBePet: true` in JSON
  • Pets persist between levels
• Pet Inventory:
  • Accessible via toolbar button (pet icon)
  • Separate from hero inventory
  • Can hold equipment and consumables
  • Items dropped on pet death
• Pet Commands (via Possess):
  • Move to position
  • Attack target
  • Follow/Stay
  • Use item

Taming a mob:

// In Mob.java
public void makePet(Hero hero) {
    this.petMaster = hero.id();
    hero.pets.add(this);
    setState(MobAi.getStateByClass(Hunting.class)); // Follow and fight
}

Pet inventory access:

// In PetInventoryManager.java
public static void giveToPet(Hero hero, Item item) {
    Pet pet = getSelectedPet(hero);
    if (pet != null && pet.collect(item)) {
        GLog.p("PetInventory_GaveItem", item.name());
    }
}

Lua pet creation:

-- Possess spell
RPD.Mob:makePet(target, caster)
target:setState(RPD.MobAi:getStateByClass("ControlledAi"))
 
-- Raise Dead
local mob = RPD.MobFactory:mobByName(latestDeadMob.class)
RPD.Mob:makePet(mob, chr)
level:spawnMob(mob)