@Mod(MasterCapstoneMod.MOD_ID)
public class MasterCapstoneMod {
    public static final String MOD_ID = "master_capstone";
    public static final Logger LOGGER = LogUtils.getLogger();
 
    public static final DeferredRegister.Items ITEMS =
            DeferredRegister.createItems(MOD_ID);
 
    /**
     * MagicCore — GemGuardian 처치 시 드롭되는 특별 아이템.
     * 희귀도 EPIC, 최대 16개 스택.
     */
    public static final Supplier<Item> MAGIC_CORE = ITEMS.registerItem("magic_core",
            props -> new Item(props
                    .rarity(Rarity.EPIC)
                    .stacksTo(16)));
 
    public MasterCapstoneMod(IEventBus modEventBus, ModContainer container) {
        LOGGER.info("Master Capstone Mod 로드 — 4개 모드 통합");
        ITEMS.register(modEventBus);
    }
}

@EventBusSubscriber(modid = MasterCapstoneMod.MOD_ID)
public class CapstoneEventHandler {
 
    @SubscribeEvent
    public static void onMobDeath(LivingDeathEvent event) {
        if (!(event.getEntity() instanceof GemGuardianEntity guardian)) {
            return;
        }
 
        Level level = guardian.level();
        if (level.isClientSide()) {
            return;  // 서버에서만 처리
        }
 
        // 특별 드롭 — MagicCore 아이템
        ItemEntity drop = new ItemEntity(
                level,
                guardian.getX(),
                guardian.getY(),
                guardian.getZ(),
                new ItemStack(MasterCapstoneMod.MAGIC_CORE.get())
        );
        level.addFreshEntity(drop);
 
        // 경험치 사운드 (사운드·파티클 폴리시는 05 챕터에서 확장)
        level.playSound(
                null,
                guardian.getX(), guardian.getY(), guardian.getZ(),
                SoundEvents.EXPERIENCE_ORB_PICKUP,
                SoundSource.NEUTRAL, 1.0f, 0.5f
        );
 
        // 처치한 플레이어에게 채팅 알림
        if (event.getSource().getEntity() instanceof ServerPlayer player) {
            player.sendSystemMessage(Component.literal("§b마법의 코어를 획득했습니다!"));
        }
    }
 
    @SubscribeEvent
    public static void onUseGem(PlayerInteractEvent.RightClickItem event) {
        ItemStack stack = event.getItemStack();
 
        // master_tools Ruby 아이템 태그 확인
        if (!stack.is(MasterCapstoneMod.RUBY_ITEM_TAG)) return;
        if (!(event.getEntity() instanceof ServerPlayer player)) return;
 
        // PURITY DataComponent 확인
        if (!stack.has(MasterCapstoneMod.PURITY_COMPONENT)) return;
 
        int purity = stack.get(MasterCapstoneMod.PURITY_COMPONENT);
        if (purity >= 75) {
            player.sendSystemMessage(Component.literal("§a고순도 보석 — 차원 입장 강화"));
        }
    }
}

Level level = guardian.level();
if (level.isClientSide()) {
    return;
}

if (!(event.getEntity() instanceof GemGuardianEntity guardian)) {
    return;
}

// ✅ 태그로 느슨하게 연결 — master_tools 내부 클래스 import 없음
public static final TagKey<Item> RUBY_ITEM_TAG =
        ItemTags.create(Identifier.fromNamespaceAndPath("master_tools", "ruby_items"));
 
// ✅ 런타임 조회 — DataComponentType 직접 import 없음
@SuppressWarnings("unchecked")
public static final DataComponentType<Integer> PURITY_COMPONENT =
        (DataComponentType<Integer>) BuiltInRegistries.DATA_COMPONENT_TYPE
                .getValue(Identifier.fromNamespaceAndPath("master_tools", "purity"));

[[mods]]
modId = "master_capstone"
# ... 기타 선언
 
[[dependencies.master_capstone]]
modId = "master_tools"
type = "required"
ordering = "AFTER"
side = "BOTH"