Upon the successful completion of a mission tasked by Saxton Hale, Soldier returns to deliver the object he was assigned to retrieve: the Bombinomicon. Unbeknownst to them however, the Bombinomicon houses an ancient wizardly foe and roommate to Soldier: Merasmus. Saxton Hale and Soldier find themselves at arms with this mad sorcerer.

After being cast into the shadows, the villainous organization known as "Limbo" rises from the darkness. Led by the scourge Doomfist, they seek to bring about a world of change. But a rag-tag group of heroes bands together to oppose the darkness.