PlayerNaturallySpawnCreaturesEvent

This event can be used for when you want to exclude a certain player
from triggering monster spawns on a server.

Also a highly more effecient way to blanket block spawns in a world

paper-api/src/main/java/com/destroystokyo/paper/event/entity/PlayerNaturallySpawnCreaturesEvent.java

@@ -0,0 +1,65 @@
+package com.destroystokyo.paper.event.entity;
+
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.player.PlayerEvent;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Fired when the server is calculating what chunks to try to spawn monsters in every Monster Spawn Tick event
+ */
+@NullMarked
+public class PlayerNaturallySpawnCreaturesEvent extends PlayerEvent implements Cancellable {
+
+    private static final HandlerList HANDLER_LIST = new HandlerList();
+
+    private byte radius;
+    private boolean cancelled;
+
+    @ApiStatus.Internal
+    public PlayerNaturallySpawnCreaturesEvent(final Player player, final byte radius) {
+        super(player);
+        this.radius = radius;
+    }
+
+    /**
+     * @return The radius of chunks around this player to be included in natural spawn selection
+     */
+    public byte getSpawnRadius() {
+        return this.radius;
+    }
+
+    /**
+     * @param radius The radius of chunks around this player to be included in natural spawn selection
+     */
+    public void setSpawnRadius(final byte radius) {
+        this.radius = radius;
+    }
+
+    /**
+     * @return If this player's chunks will be excluded from natural spawns
+     */
+    @Override
+    public boolean isCancelled() {
+        return this.cancelled;
+    }
+
+    /**
+     * @param cancel {@code true} if you wish to cancel this event, and not include this player's chunks for natural spawning
+     */
+    @Override
+    public void setCancelled(final boolean cancel) {
+        this.cancelled = cancel;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return HANDLER_LIST;
+    }
+
+    public static HandlerList getHandlerList() {
+        return HANDLER_LIST;
+    }
+}