I liked it but i kind of wish it went more into autistic detail about how Will works in terms of mechanics/actual application, and the internal politics of the senate.
I'm a bit of an idiot and I don't get the ending, though.
So Luceum and Obiteum are parallel universes that Vis went through in the labyrinth, Ulsicor's brother is stuck in one of them and there's some ancient evil that's about to awaken?