“Don’t Wake the King of the Dead”—a fantasy novel by Silvia Lame, in the adventure fantasy and humorous fantasy genres.
He is the one who lost seven hundred years ago. Buried alive under a terrible curse—neither to die nor to be saved. A necromancer who conquered half the world with an army of undead. He was feared so much that they buried with him all necromancy spells, so that no such dangerous mage would ever be born again.
And she is a girl who suddenly has nowhere to go. By the will of fate, she breaks the seal.