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Ahazu appears as a dark-skinned naked humanoid with bat-like wings, long thin arms, and an elongated head dominated with a mouth filled with needle-sharp teeth. Ahaz has long sharp talons and his legs appears to trail away into nothingness
The demon lord Ahazu earned his title of The Seizer for his portfolios of the night and of abduction. Ages past, Ahazu stumbled upon the Abyssal layer that would become the Wells of Darkness. This layer apparently lies in an infinite void called Shattered Night. The layer itself is surrounded by a planar 'membrane' that separates it from the void itself. Ahazu discovered that by digging shafts into the terrain of the layer itself, he can reach thin spots in the membrane which would act as windows to Shattered Night. After many years of digging (creating hundreds, if not thousands of shafts, or wells, as they eventually became), Ahazu finally found a planar tear that enable him to actually step into the void, which he did, never to return.
Ahazu's cult and followers eventually discovered that their patron can be contacted by pact magic and they built a fortress, called the Overlook, over the planar tear that Ahazu had stepped in. Ahazu demanded that his cult abduct other beings, dead or alive, and bring them to the layer in order to join him in the void of Shattered Night. His cult would place these beings near one of the windows/wells that Ahazu himself have dug, and Ahazu himself, as befits his title, would seize the creature through the well and into Shattered Night.
The cult soon made a fatal error in trying to capture and imprison Orcus, the Prince of the Undead. They launched an assault on his layer of Thanatos and were soundly defeated. In retaliation, Orcus' hordes swept the Wells of Darkness, destroyed Ahazu's surviving cult, and left the fortress of Overlook in ruins. Years later, a coven of varrangoins discovered the ruins, Ahazu, and the nature of the layer itself. These canny new arrivals pledged their service to Ahazu, but instead of abducting prospective prisoners on their own, they offered to use the Wells of Darkness to imprison the enemies and undesirables of others in exchange for wealth, power and prestige.
Ahazu himself can free a prisoner (although he cannot free himself) through one of the wells, or create a binding pact with other beings that whisks a creature into Shattered Night based on certain conditions. Ahazu can also absorb the life essences of those who entered Shattered Night, hence lies his primary motive for his self-imposed imprisonment. Given enough life essences, Ahazu can emerge from the void as a true deity.