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Renren's Knuckle-type Device. It's ability is to accumulate speed. It has two fatal weakness which is the accumulation of the initial speed and the resetting of the propulsion speed once Mach Grid is stopped.

Black Bird (ブラックバード Burakkubādo): Renren's Noble Art, using the speed accumulated by Mach Grid, the user moves to it's opponent's blind spot and releases a strike filled with magic. At her maximum speed, Renren can break the speed of sound.