The woman known as Scilla is a somewhat mysterious advisor to Aryan's Retinue. She is, in fact, the reason it exists, as it was her information that put Nico Brunetto on the trail of the captive Aryan Whitgor.
Her true allegiances and motives are unknown, though she has made it clear that she desires to see Val Ossus under control of House Whitgor once more.
"I greatly respect you, young lord, which is why I will be open and clear in my intentions. Your allies - you value and appreciate them, no? Yet you also utilize them - they are tools, each with a specific use, each pawns to be moved where you require them to be. You are a pawn to me, milord, but whereas your opponent is the young Rubiano, my game is played on a board far grander, against forces far more nebulous. You are my pawn, yes, but I intend to see you on the throne, with your opponents vanquished. Is that something you can live with?"