I'm in the Sect's Secret Realm

Lu Yuan came from time to time, has five elements of false spiritual roots, is a handyman of the Demon Sect, and is a useless person in cultivation. But he was the only one who could open the ruins full of dead bones. He picked up his ancestor's rusty sword in the crater and found the forbidden technique on the top of the library tower. The waste spiritual root becomes the key, the inheritance enters the body, and the technique operates. Then he saw his ancestor's last words: "Don't return to my ways. Heaven will look upon you and punish you." He fixed it.