Only thing I have to add as I’m rereading the Cakoban vision part currently, is that it states the entity chasing Cakoban had been eating every skull snake they had come across while running from the entity. This may have given the entity its form, and the willpower from a super invested Cakoban could have been a final push. I agree that it sounds similar to what Painter does to Nightmares. The remains of Ambition and the remains of Virtuosity sounds like they have similar rules and “wants”