Creation advice for D&D dungeon masters should center on immediately useful stats; creating an entire subclass for a monster players might not even fight isn't a good use of prep time. Rather ...
Call of Cthulhu is to horror roleplaying games as Dungeons & Dragons is to fantasy ... adventure ideas around each sin as well as monsters that work as a thematic fit to challenge the players.
One such character is the human archmage Mordenkainen, a scholar of the arcane and a wizard who has traversed the multiverse. He’s met monsters and dragons and watched as close friends took dark paths ...