Nature of the Sound

[Kesey]

I would hazard to guess that Azem became Hydaelyn's chosen almost immediately after the fracture. Something of a final wish, a wanting almost, by Venat in their final moments before the summoning was carried out, made manifest by Hydaelyn.

Yes, but did Azem choose to join her or did she temper him/her into service?

The answer is the difference between she is our strongest ally or she is a primal that needs to go like rest of them.