The Demon Lord Is Here, and the Good-for-Nothing Demoness Is Bewitching

Feng Qi, descendant of a tomb-raiding captain, was murdered while searching for the supreme treasure, the Nine-Eyed Sarira. By an unexpected twist, she transmigrates to a fantasy continent and becomes the Feng family's most useless good-for-nothing, a member of an ancient aristocratic clan. She expects the usual cliché of fighting monsters, leveling up, and turning a loser into a winner, but instead she unexpectedly merges with the precious sarira. The monks intend to bring her into the Buddhist fold and convert her, never realizing that she will lead every last one of them astray.