While most of the Carrion Tribes worship the rakshasa rajahs and their lesser servants, the Moon Reavers revere the night hags—fiends who spread fear by the dark of the moon. This clan is made up mostly of barbarians, but because it specializes in terror tactics and guerrilla warfare, a number of rogues are also among the membership. Whenever possible, the Reavers prefer to stalk isolated prey using methods designed to frighten them prior to making a kill. They draw this fear out for as long as possible, reveling in the terror of their victims. Clan members make masks and other decorations using the bones and skin of their victims. They file their teeth and let their nails grow long in emulation of the fiends they admire.
Karka Darkbane (NE female human barbarian 4/rogue 2) leads the Moon Reavers. She is a cruel woman twisted in mind and body by a night hag while she was still within her mother’s womb. In battle, Karka wields a mace of terror, a gift from her sinister patron, the night hag who marked her as its own before she came into the world.
Source: Eberron Campaign Setting
The Moonreavers are unique in not worshiping an Overlord. There are 9 night hags in the Wastes, who delight in crafting twisted schemes to ensnare the mortals within, and often use the tribe as their hands and eyes. The Moonreavers claim no permanent territory; instead, they roam the Wastes, often acting as intermediaries and negotiators between the tribes …and sometimes, between Carrion Tribes and the Ghaash’kala.
Source: Paladins of the Wastes