Xiao, also known as The Alchemist is the main antagonist of Season 3. She is portrayed by Jennifer Khoe, with Vanessa Kai portraying the character while she wears the appearance of Pei-Ling Zhang.
An ancient Alchemist who was killed by the emperor many years ago, she created the Bloodlines but deemed them an abomination. In the present day, she works with Bo Han, who is responsible as The Harvester to reap the souls of the Guardians and Warriors in order to fully revive her.