The Firemage's Vengeance: A Book of Underrealm

The Academy is in mourning after students and instructors alike have been murdered in its halls, but the killer is now far away across the nine kingdoms—or so they believe. When Ebon learns of a new threat within the Academy, he and his friends must work quickly to stop it—for if anyone knows the terrible secret they conceal, they could all be put to death. As the school's danger looms, and Ebon faces increasing suspicion from the new Dean, he must infiltrate the family Yerrin and learn a dark truth if he hopes to survive.