From your advice I fiddled with the BiomeGroup.cfg to match up with my spawnlistentries. My biomes were under attributes, but when I deleted attributes and put them under biomegroup the biomegroup.cfg sorted it out after a reload. It works and it's beatiful, lol.
But when i try to get Aether aerbunny in my WyvernBiome world it won't spawn. In the spawnlistenteries I have created the biome name (WyvernBiome) and added the aerbunny in the Aether.cfg file. I have also added the Aether biome to the Wyvern biome in the biomegroup.cfg file. AlI that spawn are mo'creatures? If anyone wants to see my files here they are: ...... Thank you
First few lines in Aether config
remove the aerbunny entry from there and reload your world
Just my guess, I'm not actually sure if that is the issue there.