The Purifying Helmet is a helmet worn by Skull that showed no purpose until the Arcobaleno Trials Arc. During the Arcobaleno Trials when Verde, in an attempt to kidnap the Arcobaleno, tried to use a mineral with properties similar to the Anti Tri-ni-set Radiation, Skull was seemingly unaffected. It was then shown by Verde that Skull's helmet, which he is commonly seen wearing as a baby, has purification abilities. He also had this helmet before he became an Arcobaleno, but it is unknown if it had purifying abilities back then.