Adds a new biter faction: Toxic biters, spitters and worms! They spread a deadly poison cloud and may infect buildings, taking control of turrets and other things.
Once you've got the game open, go to Mod Settings. On the "Map" tab, there's an entry for this mod about "Big creature on clouds," which I suspect is about the boss biters but IDK for sure. If it is, I'd figure unchecking it will take care of the issue on a going-forward basis (but IDK what to do about any bosses that have already spawned).
ETA: do we know if that is actually what's making for bosses?
They still spawn occasionally even with the settings off, which is really, reaaaaly annoying. Has to be a bug, since reload the game and just keep watching where they last spawn, they don't spawn again. But keeping reloading every time one decides to spawn is less than ideal