Merasmus

Merasmus is the RED Soldier's former roommate and keeper of the Bombinomicon. In the Bombinomicon comic, when the RED Demoman was seven years old, he discovered Merasmus while seeking work. Ultimately, the Demoman lost his left eye to the book, and Merasmus was forced to remove it. Years later, the magician's tumultuous relationship with the RED Soldier was revealed, and he summoned MONOCULUS for the RED team to fight. During the events of  Soldier Needs a Home , Merasmus kicked the Soldier out of his castle for being a nuisance. When he found later that the Soldier trashed his home and evicted him, he took on a ghostly form and decided to attack the Soldier's team.

Merasmus (stylized as MERASMUS!) makes an appearance in the game as the boss the players must fight in Ghost Fort.