@EventHandler
    private void unloadChunks(ChunkUnloadEvent e){
        if(e.getChunk().getEntities().length > 0) e.setCancelled(true);
    }

    public static org.bukkit.craftbukkit.v1_8_R3.entity.CraftEntity spawnMob(final CustomMob customMob, final Location loc){
        if(!loc.getChunk().isLoaded()) loc.getChunk().load();
        customMob.setLocation(loc.getX(), loc.getY(), loc.getZ(), loc.getYaw(), loc.getPitch());
        ((CraftWorld)loc.getWorld()).getHandle().addEntity(customMob, CreatureSpawnEvent.SpawnReason.CUSTOM);
        SPAWNED_MOBS.add(customMob);
        customMob.afterSpawn(loc);
        return ((EntityMonster) customMob).getBukkitEntity();
    }