I've created a custom dimension and added my custom biome into it successfully. The Biome is able to correctly affect the day/night cycle and the water color, yet I am unable to get it to spawn any mobs naturally. As far as I'm aware, the biome is the one handling which mobs get to spawn via the spawnableCreatureList/spawnableMonsterList. I've tried adding entities (My custom demon entity, cows, and enderman) to both lists and neither worked. Any ideas what might be the problem?

 

Custom Biome Class:

public class BiomeNightmare extends Biome{
	
	
	public BiomeNightmare() {
		super(new BiomeProperties("Nightmare").setBaseBiome("sky").setWaterColor(12255232).setRainDisabled());
		
		
		topBlock = ModBlocks.NightmareBlock.getDefaultState();
		fillerBlock = ModBlocks.NightmareBlock.getDefaultState();
		
		

		
		this.spawnableCaveCreatureList.clear();
		this.spawnableCreatureList.clear();
		this.spawnableMonsterList.clear();
		this.spawnableWaterCreatureList.clear();
		
		this.spawnableMonsterList.add(new SpawnListEntry(EntityDemon.class, 10, 4, 4));
	}
}

 

Edited October 16, 20186 yr by Lumby

Turns out I didn't set the light level of the dimension low enough that hostile mobs can spawn. As soon as I lowered the light level, they started to spawn like crazy