The unnamed mantle (青銅鏡の盾, Seidō-kyō no Tate?) of Perseus is one of the five Noble Phantasms granted to him by the Greek gods for the purpose of slaying Medusa. Said to be a helmet that grants invisibility in the legend, it is a mantle that allows for him to change appearance at will. While fighting as a Servant, he uses it to hide his true form along with his mask. In the world of Fate/kaleid liner PRISMA☆ILLYA, there exists Hades's Cap of Invisibility in the Gate of Babylon that may be either the same or a related Noble Phantasm.