a biome, not terrrible complex, but massive. possibly, and I’m not sure if this would have any story issues, but a MASSIVE cave under the tree with it’s roots and stuff and a base going down through a long volcanic tunnel, at the bottom is a leviathon that died after growing so large it’s couldn’t leave, this leviathon was maybe some sort of mutated collecter and it’s intellegince fuels the virus. anyway the mean point is something just absolutetly massive, I gave an idea but something else would be cool too.

I don’t like excessively huge leviathans