Overall I think Athanar sounds pretty good and interesting, actually. I'm particularly interested in how his power will end up playing out; I have another universe I write about in which telekinetics adhere to very similar circumstances of still being subject to Newton's Second Law, though those telekinetics could at least, with enough practice, compensate somewhat by exerting opposite forces on different objects to cancel out the effect on themselves. But I digress; I don't think I have any objections to that part, at least.

The part I am somewhat confused about is his demonic craving. Either it isn't stated clearly in the CS, or his craving is supposed to specifically be garnering knowledge about the Divide? You could possibly convince me to go with that if you had a good reason, but Hymith's cravings are usually one-word directives and typically not that specific. They don't usually get the directive "kill this person in particular", for instance, but rather just "kill", if that's their directive. You could conceivably make it so that Athanar's craving was simply one of knowledge in general, and that the interest in the Divide is one he decided on himself. The result would be the same, albeit with the freedom to shift focus, and it would adhere completely to the existing norms of demonspawn.