The Secrets of the Coal Mines

The fungal caverns is a densely packed area with lots of ones and tough enemies particularly the psychic octopus enemy. It's a place you can go to kind of drastically increase the chances of getting the spell so you want while taking pretty large risk. There are some kind of deeper secrets in some of those areas as well that I haven't even uncovered but I've seen kind of like uh tangentially mentioned in discords and forums and stuff did any of them ever get discovered?