Lysander Blacknail invested forty hard years of his life in service to the boar god, Tuatha, but in Lysander's greatest act of service to his god, he is betrayed. He finds himself in the body of a slime, inheriting odd abilities and an overwhelming circumstance. His only drive for survival is revenge. As a slime, the weakest monster in the world, he must discover a way to gain enough power and get his humanity back.