All I need is for only zombies to spawn. If you could do this I would be incredibly greatful. I need it before Monday if possible. Thanks!
You could use OtherDrops with a lot of flexibility in the way you can do it. Here's an example: PHP: ANY_CREATURE: - action: mobspawn drop: ZOMBIE # replace all spawns with normal zombies world: MYWORLD # only in this world You can add additional conditions such as per region, biome, heightlevel, etc. You can also modify some of the zombies stats if you want - have some be villager zombies, some baby zombies and customise their equipment too.