Trying to Tame an Evil Overlord

Yuan Xuelan was a plague upon all three Realms, a tyrant to the core. \n\nHumans, he subjugated and turned into his slaves while named himself their Emperor.\n\nDemons he slaughtered till they could only cower and worship him like a god.\n\nCultivators, he destroyed and crippled until only his own sect remained standing. \n\nAnd the Heavens could only look down in horror because even their divine power...