The Dragon's Call [The Prisoners, Book 1]

Alric doesn't remember anything.

One day he woke up in an abandoned house, and that's all he knows. He roams the lands of Furana, looking for clues about his past. That is, untill one day a few mysterious men pluck him from the streets and lock him up for a crime he didn't commit. Thinking he will spend the rest of his life in solitude, Alric is ready to give up. After what feels like an eternity, a cloaked man brings him to another location. A place where prisoners like him are turned. With the war brewing between the humans, mages and shifters, turning people into living killing machines seems to be the only solution.
Alric isn't having any of it. He refuses to be changed into a mindless monster, even if it's for the sake of Furana. He starts an underground resistance against the corrupt organisation, gathering other prisoners who share his beliefs.

Just when everything looks like it's going in the right direction, Alric discovers a new ability that will either mean the end the war, or the beginning of his downfall.