Shadow Den Dōjō

The Shadow Den Dōjō was a rogue school established by the master shinobi Soshi Ezo at Ryokō Owari Toshi. He used to forcefully brand his students, and many died during his experiments with kagenari. Those who survived became ninja, forbidden by Imperial Edict and prosecuted by Law. In 1123 Ezo was killed and his teachings were lost.