Ateru

{{people|death=Fifth century

Ateru, the Demon of Wyvern Pass, was a yobanjin warrior of the Hyōketsu tribe.

Betrayal and Death
The Hyōketsu used to stage raids against the Isawa provinces, and they made extended campaigns after a visitor from the Imperial Court paid the Hyōketsu to run daring attacks throughout Isawa lands. His betrothed, the princess Kaito no Momotsukihime, betrayed the Hyōketsu when she brokered a treaty with the Isawa, her tribe in exchange for a place among the Phoenix Clan. They became a vassal family, the Kaito, and were granted lands in the mountains of Garanto Province. Yobanjin valued freedom over all else, and many Hyōketsu refused to join the Phoenix. A civil war began among the Hyōketsu, and Kaito, who was an expert archer, killed Ateru with the bow. His corpse fell deep into a well, and a shrine, Sanpuku Seidō was built around the well, which became frozen to keep Ateru's spirit imprisoned. 

After Death
Ateru died lusting for revenge and was forgotten, his name came to mean demon in Kaito dialect. The well became a portal to Tōshigoku, his followers became onryō, and as a restless spirit Ateru began to seek the destruction of the Kaito. In 1123 his spirit and followers were totally vanished after a fight against the current Kaito Daimyō, Kaito Kosori, the Phoenix Champion Shiba Tsukune and the Scion of Earth Isawa Tadaka. 