On Hyperiridium

(reminded myself that I had an Evernote, and popped it open and found my fish-men solo adventure notes, as well as this, written in May 2015. Probably a way to tie Halthrag Keep and Space Dungeon to Black Powder Black Magic by +Eric Hoffman and +Carl Bussler  but I can't recall off the top of my head if it had been released, then)   Hyperidium is described in the scientific literature by Dr.