The Last Arbiter: Book 1 of the Seven Realms Saga by Reese Halden

An unimaginable alliance. A sneak attack. And a world oblivious to the danger it now faces. Rowan Aspen would never forget his twenty-first birthday… An unexpected explosion at his reclusive neighbor’s house launches Rowan on an adventure of epic proportions… An adventure that requires him to confront his hidden love and desires for his best friend… And a journey that will reveal mysteries, betrayal, horrific choices, and great sacrifice – one that would ultimately decide the fate of every living being on Earth— Because Rowan is the Last Arbiter.