diff --git a/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/EcoBossesPlugin.kt b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/EcoBossesPlugin.kt
index 331e2f2..b178055 100644
--- a/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/EcoBossesPlugin.kt
+++ b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/EcoBossesPlugin.kt
@@ -7,7 +7,9 @@ import com.willfp.ecobosses.bosses.bossHolders
 import com.willfp.ecobosses.commands.CommandEcobosses
 import com.willfp.ecobosses.config.EcoBossesYml
 import com.willfp.ecobosses.defence.DamageMultiplierHandler
+import com.willfp.ecobosses.defence.ImmunitiesHandler
 import com.willfp.ecobosses.defence.MountHandler
+import com.willfp.ecobosses.defence.PickupHandler
 import com.willfp.ecobosses.integrations.levelledmobs.IntegrationLevelledMobs
 import com.willfp.ecobosses.lifecycle.LifecycleHandlers
 import com.willfp.ecobosses.spawn.SpawnEggHandler
@@ -42,7 +44,9 @@ class EcoBossesPlugin : LibReforgePlugin(525, 10635, "&9") {
             LifecycleHandlers(),
             SpawnEggHandler(),
             DamageMultiplierHandler(),
-            MountHandler()
+            MountHandler(),
+            PickupHandler(),
+            ImmunitiesHandler()
         )
     }
 
diff --git a/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/bosses/EcoBoss.kt b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/bosses/EcoBoss.kt
index d9a6692..078002a 100644
--- a/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/bosses/EcoBoss.kt
+++ b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/bosses/EcoBoss.kt
@@ -27,6 +27,7 @@ import org.bukkit.Bukkit
 import org.bukkit.Location
 import org.bukkit.entity.LivingEntity
 import org.bukkit.entity.Player
+import org.bukkit.event.entity.EntityDeathEvent
 import java.util.Objects
 import java.util.UUID
 
@@ -217,12 +218,12 @@ class EcoBoss(
         messages[lifecycle]?.forEach { it.broadcast(location) }
     }
 
-    fun processRewards(player: Player, location: Location, entity: LivingEntity) {
+    fun processRewards(player: Player?, location: Location, entity: LivingEntity, event: EntityDeathEvent) {
         for (drop in drops) {
             drop.drop(location, player)
         }
 
-        xp.drop(location, player)
+        xp.modify(event)
 
         for ((index, damager) in entity.topDamagers.withIndex()) {
             val rewards = commandRewards[index] ?: continue
diff --git a/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/defence/ImmunitiesHandler.kt b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/defence/ImmunitiesHandler.kt
new file mode 100644
index 0000000..601bee1
--- /dev/null
+++ b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/defence/ImmunitiesHandler.kt
@@ -0,0 +1,46 @@
+package com.willfp.ecobosses.defence
+
+import com.willfp.ecobosses.bosses.Bosses
+import org.bukkit.entity.LivingEntity
+import org.bukkit.event.EventHandler
+import org.bukkit.event.Listener
+import org.bukkit.event.entity.EntityDamageEvent
+
+class ImmunitiesHandler : Listener {
+    @EventHandler(
+        ignoreCancelled = true
+    )
+    fun handle(event: EntityDamageEvent) {
+        val entity = event.entity as? LivingEntity ?: return
+        val boss = Bosses[entity]?.boss ?: return
+
+        when (event.cause) {
+            EntityDamageEvent.DamageCause.SUFFOCATION -> {
+                if (boss.isImmuneToSuffocation) {
+                    event.isCancelled = true
+                }
+            }
+
+            EntityDamageEvent.DamageCause.ENTITY_EXPLOSION, EntityDamageEvent.DamageCause.BLOCK_EXPLOSION -> {
+                if (boss.isImmuneToExplosions) {
+                    event.isCancelled = true
+                }
+            }
+
+            EntityDamageEvent.DamageCause.HOT_FLOOR, EntityDamageEvent.DamageCause.FIRE,
+            EntityDamageEvent.DamageCause.FIRE_TICK, EntityDamageEvent.DamageCause.LAVA -> {
+                if (boss.isImmuneToFire) {
+                    event.isCancelled = true
+                }
+            }
+
+            EntityDamageEvent.DamageCause.DROWNING -> {
+                if (boss.isImmuneToDrowning) {
+                    event.isCancelled = true
+                }
+            }
+
+            else -> {}
+        }
+    }
+}
diff --git a/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/defence/PickupHandler.kt b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/defence/PickupHandler.kt
new file mode 100644
index 0000000..9520155
--- /dev/null
+++ b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/defence/PickupHandler.kt
@@ -0,0 +1,19 @@
+package com.willfp.ecobosses.defence
+
+import com.willfp.ecobosses.bosses.Bosses
+import org.bukkit.entity.LivingEntity
+import org.bukkit.event.EventHandler
+import org.bukkit.event.Listener
+import org.bukkit.event.entity.EntityPickupItemEvent
+
+class PickupHandler : Listener {
+    @EventHandler(
+        ignoreCancelled = true
+    )
+    fun handle(event: EntityPickupItemEvent) {
+        val entity = event.entity as? LivingEntity ?: return
+        val boss = Bosses[entity]?.boss ?: return
+
+        event.isCancelled = true
+    }
+}
diff --git a/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/events/BossKillEvent.kt b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/events/BossKillEvent.kt
index 6d356cb..bdff221 100644
--- a/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/events/BossKillEvent.kt
+++ b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/events/BossKillEvent.kt
@@ -2,10 +2,12 @@ package com.willfp.ecobosses.events
 
 import com.willfp.ecobosses.bosses.LivingEcoBoss
 import com.willfp.ecobosses.lifecycle.BossLifecycle
+import org.bukkit.entity.Player
 import org.bukkit.event.HandlerList
 
 class BossKillEvent(
     boss: LivingEcoBoss,
+    killer: Player?
 ) : BossDeathEvent(boss) {
     override fun getHandlers(): HandlerList {
         return HANDLERS
diff --git a/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/lifecycle/DeathListeners.kt b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/lifecycle/DeathListeners.kt
new file mode 100644
index 0000000..6807415
--- /dev/null
+++ b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/lifecycle/DeathListeners.kt
@@ -0,0 +1,36 @@
+package com.willfp.ecobosses.lifecycle
+
+import com.willfp.eco.core.events.EntityDeathByEntityEvent
+import com.willfp.ecobosses.bosses.Bosses
+import com.willfp.ecobosses.events.BossKillEvent
+import com.willfp.libreforge.tryAsPlayer
+import org.bukkit.Bukkit
+import org.bukkit.event.EventHandler
+import org.bukkit.event.Listener
+import org.bukkit.event.entity.EntityDeathEvent
+
+class DeathListeners: Listener {
+    @EventHandler(
+        ignoreCancelled = true
+    )
+    fun handle(event: EntityDeathByEntityEvent) {
+        val boss = Bosses[event.victim] ?: return
+
+        boss.kill(BossLifecycle.KILL)
+
+        val deathEvent = BossKillEvent(boss, event.killer.tryAsPlayer())
+        Bukkit.getPluginManager().callEvent(deathEvent)
+    }
+
+    @EventHandler(
+        ignoreCancelled = true
+    )
+    fun handle(event: EntityDeathEvent) {
+        val boss = Bosses[event.entity] ?: return
+
+        boss.kill(BossLifecycle.KILL)
+
+        val deathEvent = BossKillEvent(boss, null)
+        Bukkit.getPluginManager().callEvent(deathEvent)
+    }
+}
diff --git a/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/util/Rewards.kt b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/util/Rewards.kt
index 6df4a9f..bc0224a 100644
--- a/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/util/Rewards.kt
+++ b/eco-core/core-plugin/src/main/kotlin/com/willfp/ecobosses/util/Rewards.kt
@@ -5,18 +5,25 @@ import com.willfp.eco.util.NumberUtils
 import org.bukkit.Bukkit
 import org.bukkit.Location
 import org.bukkit.entity.Player
+import org.bukkit.event.entity.EntityDeathEvent
 import org.bukkit.inventory.ItemStack
 
 data class BossDrop(
     val chance: Double,
     val drops: Collection<ItemStack>
 ) {
-    fun drop(location: Location, player: Player) {
+    fun drop(location: Location, player: Player?) {
         if (NumberUtils.randFloat(0.0, 100.0) < chance) {
-            DropQueue(player)
-                .setLocation(location)
-                .addItems(drops)
-                .push()
+            if (player != null) {
+                DropQueue(player)
+                    .setLocation(location)
+                    .addItems(drops)
+                    .push()
+            } else {
+                for (drop in drops) {
+                    location.world?.dropItemNaturally(location, drop)
+                }
+            }
         }
     }
 }
@@ -41,10 +48,7 @@ data class XpReward(
     val minimum: Int,
     val maximum: Int
 ) {
-    fun drop(location: Location, player: Player) {
-        DropQueue(player)
-            .setLocation(location)
-            .addXP(NumberUtils.randInt(minimum, maximum))
-            .push()
+    fun modify(event: EntityDeathEvent) {
+        event.droppedExp = NumberUtils.randInt(minimum, maximum)
     }
 }