Deathriser of Darkwood

After botching a resurrection spell, the kingdom's greatest wizard hitches a ride in Tera's head.

Tera never thought paying attention in her deathriser classes was a big deal. After flunking her midterms, her mom finally put her foot down and grounds Tera. That doesn't stop her from sneaking out to Summercloud Fair one night with her friends.
In a rush to beat her parents home the night of the fair, Tera witnesses the incineration of the kingdom's greatest wizard. Thinking she's about to become a hero, she attempts a basic resurrection spell from class, completely forgetting one of the most important rules-there needs to be a body.
After Aeridonis's consciousness moves into Tera's head, she learns about the true evil behind his death and realizes the new roommate in her mind is the least of her problems.