Observing from the top-most floor of the castle were Evelyn and the others.
All of them kept their eyes on the fight but it ended as expected.
Unlike Evelyn and Mavenna who were already used to Rex winning—especially ever since his triumph over the Fifthborn, both Catherine, and Radiel couldn't turn their eyes away from the fight, "Inc- Incredible... he used moonlight energy, red force, and the dominating mana of the Human race simultaneously"
Radiel couldn't hide his amazement at the spectacular showcase of strength.
Nobody in the ancient world could mimic what Rex was doing.
It was a whole new level of energy control.
In the previous era, the ones who could control two different energies at once were blatantly considered to have way above energy control—and were also deemed a powerhouse. It was not a simple feat to use more than one energy at the same time.
Depending on the energies, creating harmony might be exceptionally hard.