Legend of the Diamondstalker
A somewhat nerdy half-succubus, half-erinyes Illina took from the 42nd named layer of the abyss
Has the extraordinary ability to notice things that would normally require True Sight through intuition alone (Use a sense motive check).
Also, uses her int bonus on sense motive checks.
Illina actually owns her. There’s a contract and everything. It’s well over 900 pages long and nobody’s actually read it since it was written, but everyone gets the gist that it implies that the holder of the contract owns her body and soul.
With Devils, it’s in the details. Demons use brute force, not subtlety.
Her mother gave her the normal ‘training’ they give to every daughter, then sold her off on a whim for a box which turned out to be full of candy (you had to be there).