Jerga

The general of the demon King Subjugation Army, as well as the mentor of the hero Kanon. Possesses a deep hatred against the demon race after they killed his family.

Due disagreeing with the idea of Kanon of making peace with the demon race, he murdered his own student. Later, he created the Hero Academy as a way to assure his hatred and animosity for demons would never be forgotten. Before dying, he divided his root into two; one half was fused with the spell Asc (making anyone who used it develop the same hatred for demons that Jerga did), while the other was used to create the humanoid magic Eleanore.

In the 13th episode, Diego revives him as the spell Demon Judgement Jerga, turning him into a gigant made of Holy Magic unable to be killed by conventional means.