Ba'uk, the Eater of Bone, is a Lamna who acts as the the judge and the usher of the dead in the imperial_religion. She invariably appears to mortals in the form of a giant, skeletal takma with three heads. When a mortal dies and is interred in the earth or in the sea, it is to the deep caves of Ba'uk they are brought, where they must tell the tale of their life to Her while She sits in judgment. The heads on the left and right do not speak to mortals, their function being to listen and tally up the deeds of the teller - one the good, the other the bad - and then to whisper into the nearest aural hole of the center head the summation of the teller's sins or virtues. The center head then weighs the one against the other and speaks its judgment.

All are judged, and all have their bones eaten and the remainder of their bodies thrown into uvuun's abyss; but what hinges upon the judgment is the fate of their souls. Those of the sinful and the wicked are cast down into the abyss with their boneless husks, to be hunted and devoured by Dark-Eyes Himself, while the souls of the virtuous are set free to take wing, and join the siathar in Kastun.

Ba'uk is worshiped primarily through the offering of the bones of the dead, which are interred in the ground or in the sea as Her price for Her judgment; but often, in an attempt to tip the scales of judgment toward clemency, there will additionally be gifts of valuables and promises by the relatives of the deceased that they will make up for the misdeeds of their departed.

In a strictly factual sense, Ba'uk may possibly be one mortal interpretation of an actual cosmic being, though if so, its accuracy may be up for debate.