Add Vampiric Modifier

MODIFIERS.md

@@ -104,6 +104,10 @@ These effects are applied when holding the tool.
 **id:** `spawner` | **crafting:** `minecraft:mossy_cobblestone` ![mossy_cobblestone](https://raw.githubusercontent.com/anish-shanbhag/minecraft-api/master/public/images/items/mossy_cobblestone.png)
 
 **Decription:** While holding the spawners around you will glow.
+### Vampiric
+**id:** `vampiric` | **crafting:** `minecraft:fermented_spider_eye` ![fermented_spider_eye](https://raw.githubusercontent.com/anish-shanbhag/minecraft-api/master/public/images/items/fermented_spider_eye.png)
+
+**Decription:** Heals player for 5% of damage dealt to enemies, but prevents natural health regeneration and causes 0.5 hearts damage per 30 seconds when not hitting enemies.
 ## Users
 These effects are applied when right clicking.
 ### Fire Starter
@@ -224,6 +228,10 @@ These effects are applied when hurting enemies.
 **id:** `soulbound` | **crafting:** `minecraft:nether_star` ![nether_star](https://raw.githubusercontent.com/anish-shanbhag/minecraft-api/master/public/images/items/nether_star.png)
 
 **Decription:** Grants 15% bonus damage and mining speed when wielded by the original owner.
+### Vampiric
+**id:** `vampiric` | **crafting:** `minecraft:fermented_spider_eye` ![fermented_spider_eye](https://raw.githubusercontent.com/anish-shanbhag/minecraft-api/master/public/images/items/fermented_spider_eye.png)
+
+**Decription:** Heals player for 5% of damage dealt to enemies, but prevents natural health regeneration and causes 0.5 hearts damage per 30 seconds when not hitting enemies.
 ### Withering
 **id:** `wither` | **crafting:** `minecraft:wither_rose` ![wither_rose](https://raw.githubusercontent.com/anish-shanbhag/minecraft-api/master/public/images/items/wither_rose.png)
 

src/main/java/dev/marston/randomloot/loot/modifiers/ModifierRegistry.java

@@ -3,6 +3,7 @@
 import dev.marston.randomloot.loot.modifiers.breakers.*;
 import dev.marston.randomloot.loot.modifiers.holders.*;
 import dev.marston.randomloot.loot.modifiers.hurter.*;
+import dev.marston.randomloot.loot.modifiers.hurter.Vampiric;
 import dev.marston.randomloot.loot.modifiers.hurter.Pummeling;
 import dev.marston.randomloot.loot.modifiers.hurter.Soulbound;
 import dev.marston.randomloot.loot.modifiers.stats.Busted;
@@ -56,6 +57,7 @@ public static Modifier getModifier(String name) {
 	public static Modifier CHARGING = register(new Charging());
 	public static Modifier COMBO = register(new Combo());
 	public static Modifier DRAINING = register(new Draining());
+	public static Modifier VAMPIRIC = register(new Vampiric());
 	public static Modifier POISONOUS = register(new HurtEffect("Poisonous", "poison", 5, MobEffects.POISON));
 	public static Modifier WITHERING = register(new HurtEffect("Withering", "wither", 3, MobEffects.WITHER));
 	public static Modifier BLINDING = register(new HurtEffect("Blinding", "blinding", 4, MobEffects.BLINDNESS));
@@ -102,10 +104,10 @@ public static Modifier getModifier(String name) {
 
 	public static final Set<Modifier> BREAKERS = Set.of(EXPLODE, LEARNING, ATTRACTING, VEINY, MELTING, EXCAVATOR, PROSPECTOR, MUNCHIES, FRAGILE, LUMBERING);
 	public static final Set<Modifier> USERS = Set.of(TORCH_PLACE, DIRT_PLACE, FIRE_PLACE, FIRE_BALL, VOID_TOUCHED);
-	public static final Set<Modifier> HURTERS = Set.of(CRITICAL, CHARGING, FLAMING, COMBO, DRAINING, POISONOUS,
+	public static final Set<Modifier> HURTERS = Set.of(CRITICAL, CHARGING, FLAMING, COMBO, DRAINING, VAMPIRIC, POISONOUS,
 			WITHERING, BLINDING, BEZERK, NEMESIS, SOULBOUND, SCORCHED, FROZEN, OVERGROWN, FIERCE, FEASTING, EXECUTIONER, CROWD_PLEASER, PUMMELING, HAILEYS_WRATH, MUNCHIES, CHAOTIC, FRAGILE, CLUNKY, EARLY_BIRD);
 	public static final Set<Modifier> HOLDERS = Set.of(HASTY, ABSORBTION, FILLING, RAINY, ORE_FINDER, SPAWNER_FINDER,
-			LIVING, REGENERATING, RESISTANT, FIRE_RESISTANT, AQUATIC, HUNTER, FEASTING, NATURALIST, CLUNKY);
+			LIVING, REGENERATING, RESISTANT, FIRE_RESISTANT, AQUATIC, HUNTER, FEASTING, NATURALIST, CLUNKY, VAMPIRIC);
 
 	public static final Set<Modifier> STATS = Set.of(BUSTED, FIERCE, MUNCHIES, CHAOTIC, FRAGILE);
 

src/main/java/dev/marston/randomloot/loot/modifiers/hurter/Vampiric.java

@@ -0,0 +1,167 @@
+package dev.marston.randomloot.loot.modifiers.hurter;
+
+import dev.marston.randomloot.loot.LootItem;
+import dev.marston.randomloot.loot.LootItem.ToolType;
+import dev.marston.randomloot.loot.LootUtils;
+import dev.marston.randomloot.loot.modifiers.EntityHurtModifier;
+import dev.marston.randomloot.loot.modifiers.HoldModifier;
+import dev.marston.randomloot.loot.modifiers.Modifier;
+import net.minecraft.ChatFormatting;
+import net.minecraft.core.particles.ParticleTypes;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.network.chat.Component;
+import net.minecraft.network.chat.MutableComponent;
+import net.minecraft.world.damagesource.DamageSource;
+import net.minecraft.world.effect.MobEffectInstance;
+import net.minecraft.world.effect.MobEffects;
+import net.minecraft.world.entity.Entity;
+import net.minecraft.world.entity.LivingEntity;
+import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.level.Level;
+
+import java.util.List;
+
+public class Vampiric implements EntityHurtModifier, HoldModifier {
+
+	private String name;
+	private long lastHit;
+	private static final float HEAL_PERCENT = 0.05f; // 5% of damage dealt
+	private static final int DRAIN_INTERVAL = 600; // 30 seconds (600 ticks)
+	private static final float DRAIN_DAMAGE = 1.0f; // 0.5 hearts
+
+	public Vampiric() {
+		this("Vampiric", 0L);
+	}
+
+	public Vampiric(String name, long lastHit) {
+		this.name = name;
+		this.lastHit = lastHit;
+	}
+
+	public Modifier clone() {
+		return new Vampiric();
+	}
+
+	@Override
+	public CompoundTag toNBT() {
+		CompoundTag tag = new CompoundTag();
+		tag.putString(NAME, name);
+		tag.putLong("lastHit", lastHit);
+		return tag;
+	}
+
+	@Override
+	public Modifier fromNBT(CompoundTag tag) {
+		return new Vampiric(
+			tag.getStringOr(NAME, "Vampiric"),
+			tag.getLongOr("lastHit", 0L)
+		);
+	}
+
+	@Override
+	public String name() {
+		return name;
+	}
+
+	@Override
+	public String tagName() {
+		return "vampiric";
+	}
+
+	@Override
+	public String color() {
+		return ChatFormatting.DARK_RED.getName();
+	}
+
+	@Override
+	public String description() {
+		return "Heals player for 5% of damage dealt to enemies, but prevents natural health regeneration and causes 0.5 hearts damage per 30 seconds when not hitting enemies.";
+	}
+
+	@Override
+	public void writeToLore(List<Component> list, boolean shift) {
+		MutableComponent comp = Modifier.makeComp(this.name(), this.color());
+		list.add(comp);
+	}
+
+	@Override
+	public Component writeDetailsToLore(Level level) {
+		if (level != null && lastHit > 0) {
+			long timeSinceHit = level.getGameTime() - lastHit;
+			long secondsSinceHit = timeSinceHit / 20;
+
+			if (secondsSinceHit < 30) {
+				return Modifier.makeComp("Fed (" + (30 - secondsSinceHit) + "s)", ChatFormatting.GREEN);
+			} else {
+				return Modifier.makeComp("Hungry!", ChatFormatting.DARK_RED);
+			}
+		}
+		return null;
+	}
+
+	@Override
+	public boolean forTool(ToolType type) {
+		return type.equals(ToolType.SWORD) || type.equals(ToolType.AXE);
+	}
+
+	@Override
+	public boolean hurtEnemy(ItemStack itemstack, LivingEntity hurtee, LivingEntity hurter) {
+		Level level = hurtee.level();
+		float damage = LootItem.getAttackDamage(itemstack, LootUtils.getToolType(itemstack));
+
+		// Heal the player for 5% of damage dealt
+		float healAmount = damage * HEAL_PERCENT;
+		hurter.heal(healAmount);
+
+		// Update last hit time
+		this.lastHit = level.getGameTime();
+		LootUtils.updateModifier(itemstack, this);
+
+		// Visual feedback - red particles for lifesteal
+		if (!level.isClientSide()) {
+			Modifier.TrackEntityParticle(level, hurter, ParticleTypes.DAMAGE_INDICATOR);
+		}
+
+		return false;
+	}
+
+	@Override
+	public void hold(ItemStack stack, Level level, Entity holder) {
+		if (!(holder instanceof LivingEntity livingEntity)) {
+			return;
+		}
+
+		// Prevent natural regeneration
+		MobEffectInstance hungerEffect = new MobEffectInstance(MobEffects.HUNGER, 3, 0, false, false);
+		livingEntity.addEffect(hungerEffect);
+
+		// If we haven't hit anything recently, drain health
+		if (lastHit > 0) {
+			long timeSinceHit = level.getGameTime() - lastHit;
+
+			// Every DRAIN_INTERVAL ticks after the last hit, apply damage
+			if (timeSinceHit > 0 && timeSinceHit % DRAIN_INTERVAL == 0) {
+				if (holder instanceof Player player) {
+					// Create a custom damage source that bypasses armor
+					DamageSource vampiricDrain = level.damageSources().magic();
+					player.hurt(vampiricDrain, DRAIN_DAMAGE);
+
+					// Visual feedback - dark red particles
+					if (!level.isClientSide()) {
+						Modifier.TrackEntityParticle(level, player, ParticleTypes.SOUL);
+					}
+				}
+			}
+		}
+	}
+
+	@Override
+	public boolean compatible(Modifier mod) {
+		// Not compatible with Necrotic (Draining) to avoid lifesteal stacking
+		if (mod.tagName().equals("necrotic")) {
+			return false;
+		}
+		return true;
+	}
+}

src/main/resources/data/randomloot/recipe/trait_vampiric.json

@@ -0,0 +1,8 @@
+{
+  "type": "randomloot:trait_change",
+  "item": {
+    "count": 1,
+    "id": "minecraft:fermented_spider_eye"
+  },
+  "trait": "vampiric"
+}