Actual implementation found in:

• HeartOfDarkness.java - Contains the HeartOfDarkness artifact and HeartOfDarknessBuff class

Full class implementation:

package com.nyrds.pixeldungeon.items.guts;
 
import com.nyrds.pixeldungeon.ml.R;
import com.nyrds.pixeldungeon.mobs.guts.SpiritOfPain;
import com.nyrds.platform.util.StringsManager;
import com.watabou.pixeldungeon.actors.Char;
import com.watabou.pixeldungeon.actors.mobs.Mob;
import com.watabou.pixeldungeon.items.rings.Artifact;
import com.watabou.pixeldungeon.items.rings.ArtifactBuff;
import com.watabou.pixeldungeon.ui.BuffIndicator;
 
public class HeartOfDarkness extends Artifact {
 
	public HeartOfDarkness() {
		imageFile = "items/artifacts.png";
		image = 18;
	}
 
	@Override
	public boolean isIdentified() {
		return true;
	}
 
	@Override
	public ArtifactBuff buff() {
		return new HeartOfDarknessBuff();
	}
 
	public static class HeartOfDarknessBuff extends ArtifactBuff {
		@Override
		public int icon() {
			return BuffIndicator.DARKVEIL;
		}
 
		@Override
		public String name() {
            return StringsManager.getVar(R.string.DarkVeilBuff_Name);
        }
 
		@Override
		public String desc() {
            return StringsManager.getVar(R.string.DarkVeilBuff_Info);
        }
 
		@Override
		public int defenceProc(Char defender, Char enemy, int damage) {
			int defenderPos = defender.getPos();
			int spiritPos = defender.level().getEmptyCellNextTo(defenderPos);
 
			if (defender.level().cellValid(spiritPos)) {
				SpiritOfPain spirit = new SpiritOfPain();
				spirit.setPos(spiritPos);
				Mob.makePet(spirit, defender.getId());
				defender.level().spawnMob(spirit, 0, defenderPos);
			}
			return damage;
		}
	}
}

• icon() - Returns BuffIndicator.DARKVEIL for the buff icon
• name() - Returns localized buff name from DarkVeilBuff_Name string resource
• desc() - Returns localized buff description from DarkVeilBuff_Info string resource
• defenceProc() - Called when the wearer takes damage; spawns a SpiritOfPain pet nearby

The HeartOfDarknessBuff is automatically applied when the hero equips the Heart of Darkness artifact. Its primary function is:

• Triggers on damage taken (via defenceProc method)
• Spawns a SpiritOfPain mob as a pet adjacent to the defender
• The SpiritOfPain is allied with the hero (created via Mob.makePet())
• Requires a valid empty cell next to the hero for spawning

<!-- English (values/strings_all.xml) -->
<string name="DarkVeilBuff_Name">Dark veil</string>
<string name="DarkVeilBuff_Info">A veil of darkness surrounds the owner, summoning a spirit every time damage is taken.</string>
 
<!-- Russian (values-ru/strings_all.xml) -->
<string name="DarkVeilBuff_Name">Тёмная вуаль</string>
<string name="DarkVeilBuff_Info">Вуаль тьмы окружает владельца, призывая духа каждый раз при получении урона.</string>

• HeartOfDarkness - Parent artifact item
• SpiritOfPain - Mob spawned by the buff
• Artifact - Base class for artifact items
• ArtifactBuff - Base class for artifact buffs

None - This buff is implemented purely in Java without JSON configuration.

None - This buff is implemented purely in Java without Lua scripting.