The Chalice Rouzer (カリスラウザ Karisu Rauza) is a unique transformation device bestowed upon the Joker Undead. When Rouzed with the Mantis Undead he becomes the Kamen Rider Chalice. The full extent of its power is unknown, but the Chalice Rouzer is capable of reproducing the DNA of sealed Undead and mimic their forms with frightening accuracy, as well as their respective powers and abilities. Further adding to its uniqueness, is that the Chalice Rouzer utilizes the "Swipe" function, which became the template for the Rider System's "Rouzer" technology.