Baron Mauser is an overgrown cat found in New Varrock. He is located on 2nd floor[UK]3rd floor[US] of the church, and he demands milk from a zombie cow. He is one of four cats, along with 'Fraidy cat, Catbot 9000 and Grumps that the player needs to shoo away for "The Cats Bane" task.
After the completion of the task "Cats Bane" he can be found at the graveyard on the west New Varrock bank trying to resurrect Fluffs. He may thereafter be found in Gertrude's house.
- His name is a play on the German word for mouse ("Maus").