I like these weird little creatures. I doubt anything like this could be found in Kuramen, but enough of the world is still nebulous that there might be some echo; we'll see as it develops, no?
I particularly like the note about the hazards of injuring one; toxic alchemical mixtures, quasimystical vapors, and outright detonations. Could make for an interesting battle if a fight broke out near one for some reason; neither side wants to hurt the giant worm, for fear of what might result. Go to Comment
The spellbook of a long dead wizard that has gained the ability to read itself and cast spells from itself. If could be amazingly powerful as an ally, or use its magic to manipulate and rule a kingdom.