Invisible Sabre Demon was indeed incomparably strong and ferocious. She was basically akin to an ancient martial art practitioner in the beginning stage of the Embryonic Breathing realm. She was very similar to Envoy Guiluo of the heterodox people that Mo Wen had met before.
It was no wonder that she could become the King of the Ring of the second level in the Challenge Main Hall. Her abilities were so strong that they had basically surpassed all the ancient martial art practitioners in the Qi Nucleation realm.
However, although Invisible Sabre Demon's one slash had penetrated Mo Wen's Great Yin Yang Swirls, it had also immediately revealed her position. He laughed coldly and with a flash of his figure, he dashed forward towards Invisible Sabre Demon, who was levitating in mid-air.