Sai Nai Mu is the Holy Maiden of the Hundred Witchcraft Sect and a princess of the Hundred Witchcraft Country in the Western Regions. She leads 15 women to offer allegiance to Emperor Zhou An, using her knowledge of poison and witchcraft to help him counter the Empress Dowager. She gives Zhou An a Hundred Poisons Pearl to detect toxins. She later becomes intimate with Zhou An and seeks his support in uniting the Western Regions kingdoms. She is a key ally and likely love interest.
