The Lens of Invincibility (無敵鏡 Muteki kagami?) are a pair of antique glasses which Cologne had brought with her from the Joketsuzoku village. Originally it was part of a series of items worn by the infant or weak Joketsuzoku to protect themselves from bandits as they were unable to do so otherwise. The lenses are held with a stick attached to the side of them, in a similar fashion to that commonly associated with opera glasses. Should the lens been worn in reverse, their effect shifts to the wearer, forcing them to bow down in tears and apologize to their opponent.