Survive (サバイブ Sabaibu) form is the ultimate form of the 13 Kamen Riders . Though theoretically all 13 Riders can access their own Survive Form, only Ryuki's and Knight's have been seen on-screen. Several others have been seen in concept art and the S.I.C. Hero Saga stories Kamen Rider Ryuki: Advent Calendar and Kamen Rider Ryuki: World of If.