The following changes have been made to mob spawning:
- Slimes will randomly spawn if it's dark enough in any biome except the Nether biome.
- Wither Skeletons will randomly spawn if it's dark enough in the Nether biome.
- In a Deep Ocean biome, any squids that spawn BELOW a Primsarine block will become Guardians.
- Withers spawned will have a custom name indicating they belong to your island and will not be able to leave your island or damage other nearby islands.