It’s based on a 3rd party expansion on the dream realm. A large part of that expansion relies on a conceit that in the future a psionic god is killed and this creates something which then uses the dream realm to travel back in time to make sure that betrayal happens. The art is like a yuanti with 2 arms and crystal bludgeon tail
Edit - ninjad
Edit 2 - with regards to the slaad: the problem with that is that almost any slaad wouldn’t balk at eating babies. They are carnivorous and notorious for eating sentient beings. Moreover I can’t see a slaad being influenced by ochul to be more lawful in the way MitD seems to.