Survive Form

Survive Form (サバイブ体) 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.