The Return of the Wraith King

Caleb Vance is the youngest of the Vance family and is taken for someone with no cultivation at all. When his sister Elara runs into trouble during her examination for the Ghost General rank, he calls out the weakness in the spirit she is up against, which is enough for her to win. The family has been fighting over the spirit pendant Elara's father left behind, and that fight has never really stopped. The Graves family uses the opening, makes common cause with the Fiendkin, and attacks. Caleb has to say what he is, which is the Wraith King reborn, the most powerful being the Caelian Empire ever had. He pulls the human Wraithmaster clans together and brings in the Twin Reapers, goes at the seal that was set a hundred years ago and at the question of what was put behind it, and works his way up toward the Abyssal Sovereign realm.