The Petal Hack

From publisher blurb: Tékumel is a place with the politics and intrigue of the Roman Empire, the religions of ancient India and pre-Columbian Mesoamerica, the magic of the Arabian Nights, the monsters and demons of the Cthulhu mythos, plus ancient ruins containing the technology of a good space opera thrown in just to keep things interesting. The Petal Hack strips the rules down to a minimum so you can focus on character and setting. Experience the exotic adventure of Tékumel.