Originally Posted by MarcHicks
I would assume she is a Deva:

https://forgottenrealms.fandom.com/wiki/Deva

Being a Deva of Selune, I suspect Shar expected Ketheric to kill her, as a "loyal" Sharran. But instead he got Balthazar to Soul Chain her in order to grant him immortality. I suspect at this point he was already a chosen of Myrkhul, probably due to the death of his daughter (which is ironic given it was the death of his wife, a Selunite, that turned him to Shar in the first place). A lot of the information regarding all of this stuff can be found if you search moonrise towers thoroughly enough.
Except if you actually read the material, Ketheric only turns to Myrkul AFTER he is sealed. Which means long after turning Aylin to the Shadowfell. Which earns after the soul chain.

And Aylin is called an Aasimar, not a Deva.

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