The God of Sand and Storms (2009)

Publisher Blurb:

Has any real world mythological god appeared in more roleplaying game settings than Set? He’s stalked Africa in the RIFTS universe, caused chaos among the clans of Vampire: The Masquerade, and even found his way into Faerun and Ravenloft at various times. With the exception of the Devil himself, few mythical figures scream "evil" like Set.

But evil is such a...relative term.

Mythos: The God of Sands and Storms explores the Set mystique and presents an alternative history for storytellers and game masters looking to shake up their setting pantheons. As an entity that is the embodiment of necessary chaos, Set’s followers are less concerned with the abstract moral confines of good versus evil and instead focus their efforts on breaking down those institutions and powers that refuse to evolve. Dig deep into the root cause of the war between Horus and Set, and unlock the true mysteries of the Cult.