The Dojo of the Razor's Edge was relatively new, having been founded in the 12th century by the "Dead Eyes" Berserkers led by Hiruma Yugure. The dojo was established after the fall of Hida Amoro, and the Berserkers, feeling shamed by Amoro's actions and his death, moved their dojo far from civilized -- even civilized by Crab standards -- lands. The students spent their time learning to master and channel their rage.