I Failed Alchemy School and Accidentally Invented Immortality: Book 3 (Immortal Alchemist: A Cozy Overpowered MC LitRPG)

Eight hundred years is a long time to wait for company. At the bottom of the Sump, the door stands open and a fire is lit. The dungeon's heart has a story to tell about immortality. Up top, the Crucible wants Kett contained, and the Crown wants to know what he's worth. Six days east, the Pale is splitting like an old seam, and something mindless is crawling through. Kett could hold it back by himself. He invented immortality by accident, after all. He could probably hold it forever. But he'd rather not. That means asking for help from a town, an Academy, a former rival, and the woman he loves. Kett has never been good at asking. For the first time in his life, the world's worst alchemist is going to blow something up on purpose.