Originally Posted by Omegaphallic
https://forgottenrealms.fandom.com/wiki/Elder_Evil

In addition to Elemental evils of various types, it seems some Primordials like Ubtao and Telos can also offer Great Old One Pacts.

Would that make Demogorgon a possibility for a great old one pact do to him being a primordial?

Cthulhu: FOR THOUSANDS OF YEARS I LAY DORMANT, WHO HAS DISTURBED MY- Oh its you...
Warlock: Greetings my lord-
Cthulhu: LET ME SLEEP-