The fantasy story I'm plotting features an amulet which originally belonged to an evil prophet/priest/sorcerer but has somehow fallen into the hands of a pirate who is one of the protagonists. The amulet contains a fragment of black stone (actually a meteorite) and is believed to confer magical powers onto its owner. My problem is that I have no idea what powers those might be. The bad guy's culture is heavily Middle Eastern-inspired, so it would be great if the amulet somehow referenced Middle Eastern (e.g. Semitic, Mesopotamian, Persian, or Indian) mythology.