[Red Wizard Tower.]
Ace sat on his throne, the highest position in the red tower. Ace stepped in to replace Xavier after the old man died. Edith, who was supposed to replace Xavier, turned to betray wizards by supporting the werewolves. War ensued. At that time, many wizards were scrambling to occupy Xavier's throne and did not think about the humans' miserable fate.
Ace, waiting for Edith's return for so long, chose to continue his training and become a wizard. Ace forced himself to master the four elements of magic. Although not perfect like Edith. Ace could already master white, black, green, and red magic. Ace thought that by being the strongest, he could bring Edith back to him.
Then at the peak of the war with werewolves, Ace actually killed Edith because Edith had turned into a protector for werewolves. His heroic act made the wizards recognize Ace's power and elevated him to be the supreme mage.