HP: Eastern Mystic and the Dark Lord's Mark

Feng Xingchen's wild magic has killed seven familiars in twelve years—now China's Tianheng Sect is shipping their problem child to Hogwarts. As Senior Disciple, she's supposed to teach, not cause chaos. But the Sorting Hat screams 'Slytherin,' a dark-haired professor won't stop applauding, and a platinum-blonde aristocrat keeps tugging her sleeve. Welcome to Hogwarts, where Eastern cultivation meets Western wizardry—and nothing will ever be the same. Dark Dumbledore AU. OOC warning.