C169 Mage Xuan Ji
Bai Ruoping's master, Mage Xuan Ji, was the vice principal of the Superpower Academy. He was also the strongest person in the entire academy.
If Rex was the representative of the Vessel Academy, then he was the representative of the other Four Vital Energy Academies. Whether it was his martial prowess, Psychokinesis, psychic force or Wind Aura, they were all top experts