Some friends and I came up with a twist on Lord Blot that makes the sentient sphere a million times creepier.
I’ve transcribed the relevant part of the conversation below. Yes, it mentions Tharizdun (AKA, Greyhawk’s Cthulhu), but you can substitute any primordial, evil, imprisoned being. Most campaign settings have one.
I can see Lord Blot worshiping a god like Tharizdun.
Buddy, friend, pal. Where do you think the gods put Tharizdun all those eons ago when they imprisoned him? What sort of prison might seal Him off from all other existence?
Let’s keep going: Why do you think Lord Blot suddenly became sentient? Why do you think Blot is at war with both heaven and hell?
And what do you think will emerge when adventurers heedlessly force Lord Blot through a gate, destroying the sphere —
— and that horrible rip in space appears?
And there you go: The end of your campaign world as you know it, all tied up in a …