… and yet it can hacked, updated, modified, and otherwise screwed with in many fascinating ways, which is what Zak's doing right now. Following his awesome Old One-ification of the Aboleth, he's on to Angels, and it's good, good stuff. I particularly like ranking the things based on old Hebrew lore.
Angels (split into deva, planetar and solar and all barely distinguishable) come right after the aboleth in the manual and have a similar problem–since they, too, strongly rely on a monotheism for their impact. Plus they’re good which means there aren’t a lot of reasons to fight them.