So I have multiverse on my server, and I have one world in particular that I wan't to naturally spawn ghasts in. Problem is ghasts only spawn in the nether. Is there any plugin that will let me control what mobs spawn in my multiverse worlds?
Probably not, but it would be fairly easy to write one. You could also just try a custom mob plugin like MythicMobs, i believe they allow you to choose what spawns where..
This plugincan do this i think: https://www.spigotmc.org/resources/mythicmobs.5702/ I use it on my server and it works great!