What Kind of Journey to the West Is This?

(Journey to the West setting, with plenty of original elements) An Yanxia arrives in the world of Journey to the West, hoping to become a wealthy landowner, only to find herself frail and close to death. After six years of searching for immortals, she still hasn't found a way to live forever, but at least her save-and-rebirth System panel has awakened. In her first life, she has a fortune. In her second, she finds an immortal. By her ninth, she succeeds in building her foundation, and the gates of the immortal sects open to her. In her thirtieth life, just after emerging from seclusion, the young woman hears that the Buddha of the Western Heaven has named her a Demon King.

Yanxia strides into Lion Camel Ridge and surveys the host of demons. A hundred and eight thousand fiends watch as a young woman, who calls herself a good person for thirty lifetimes and radiates bloodlust, comes charging from the east, killing her way west toward Spirit Mountain. The great demon lords bow their heads on the ridge and ask respectfully, "May we ask where the Demon King is headed?"

"Hmm?" The young woman turns around, and every demon drops dead.

"I am a good person who has cultivated for thirty lifetimes. You fiends, stop slandering me!"