He doesnt, he states his will is not his own. The nine are the ones helping us out, and even that is questionable. The nine in grimore have already shown themselves to be crafty manipulators. They gave the queen the harbingers so she could defeat the fallen and as a side effect save the city from the wolves joining the battle of twilight gap. Then when the queen send them skolas as a thank you gift they instead release him a means of making us work with the reef, strengthening our relations with them. So maybe they are trying to help us, make us stronger, but they are shown to be quite craft as stated above. So i thunk a bigger question is what do they want from us. And im not talking strange coins.