The Baleful Sorcerer of Tsathag'kha

From publisher blurb: What if you want to play a sinister student of the black arts like in a sword-and-sorcery pulp? This is an alternative (and old school, in my opinion) magic-user class for those who want something a little different, influenced by Clark Ashton Smith. The Baleful Sorcerer of Tsathag'kha is compatible with the original fantasy roleplaying gameand RPGs of such ilk.