The Blay Buckle (ブレバカル Bure Bakaru) is a transformation device that Kazuma Kenzaki uses to become Kamen Rider Blade. It was the second Rider System developed by B.O.A.R.D. intended as a means to combat the Undead via the fusion of Undead DNA and human DNA. The Blay Buckle was designed for specific compatibility with the ♠A: "Change Beetle" Rouse Card and harnesses the DNA of the Beetle Undead. This model utilizes the "Turn Up" mechanism to produce a stationary transformation screen, which initiates the fusion of Undead DNA with a human to produce the transformation. Coincidentally, the transformation screen itself can act as a deflective wall against assaults.