A contract. [ is the matter-of-fact reply. She has a book on her belt with the same symbol on the front. A wave of her hand and it floats in front of her, flipping open, pages rustling. If he had any doubts about her humanity, well. That should probably put an end to them. ]

Of course, you've yet to agree to anything, and I am nothing if not fair. Consider this your chance to back out- but I can promise you that, should you agree, the power you desire will be yours.

[ A motion of her hand sends the book floating towards him, open to a simple incantation. A spell of binding. A verbal signature. ]

And to answer your earlier question, my name is Maya, and I am one of the six Sirens.