Rōen

In the past, Rōen frequently attacked the Howling Wolf Village, killing its villagers by absorbing their chakra. The Kodon clan was able to defeat Rōen by sealing it into their clan's shrine. Time passed and Rōen became a myth. Decades later, when the Howling Wolf Village began contemplating declaring neutrality, Tenma Kodon released Rōen from the shrine. Using saigenzai to control it, Tenma had Rōen attack the village in order to sway the villagers against neutrality. During the village's defence, however, Tenma lost control of Rōen because of the Kumanoi clan's blue fire powder. He and his wife tried to seal it back into the shrine, but his wife was killed and he could not perform the seal by himself. After failing to seal Rōen into his oldest son, Reishi Kodon, Tenma sealed it into his youngest son, Kina Kodon. Tenma died in the effort, leaving only Reishi to know that Kina contained the monster.