Kyuko-sei

In the depths of legend, the tale of the Kyuko-sei bloodline is inscribed with blood and ink upon a parchment guarded within the Temple of Izanagi. It recounts the story of Kyuko, a master of Ninjutsu, who witnessed her brother poised to seize the leadership rightfully hers upon their father's demise. Determined not to succumb to defeat, she infused her chakra with a Stone of Heraldry, renowned for its ability to cleanse one's bloodline. Once this bond was forged, she bestowed the stone upon her brother's wife, scion of the Endless Erosion family, in the form of an amulet.

She accepted the gift and wore it around her neck, unaware that the stone was draining the strength of her bloodline. However, instead of dissipating, this power flowed into Kyuko through the connection she had forged, granting her the strength to vanquish her brother. Thus began the lineage of Kyuko-sei, rising mighty in the mastery of wind and earth.