From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Zach Brown <zach.brown@destroystokyo.com>
Date: Tue, 1 Mar 2016 23:58:50 -0600
Subject: [PATCH] Configurable top of nether void damage


diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index ab2671c21f2f44973fb2507b178ac8e1e03bc8dc..ce5f30b761ddaa2b3b241903d75770d0c5050d92 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -705,7 +705,12 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource {
     }
 
     public void checkOutOfWorld() {
-        if (this.getY() < (double) (this.level.getMinBuildHeight() - 64)) {
+        // Paper start - Configurable nether ceiling damage
+        if (this.getY() < (double) (this.level.getMinBuildHeight() - 64) || (this.level.getWorld().getEnvironment() == org.bukkit.World.Environment.NETHER
+            && level.paperConfig().environment.netherCeilingVoidDamageHeight > 0
+            && this.getY() >= this.level.paperConfig().environment.netherCeilingVoidDamageHeight
+            && (!(this instanceof Player player) || !player.getAbilities().invulnerable))) {
+            // Paper end
             this.outOfWorld();
         }