After coming to the Dark King's house, Theo continued his training. He had received three big things that needed his attention, so this training session would become even longer.
The first one would be his Order. He managed to learn more about his Order, especially regarding the ability to remove and add the element to the Magic Power. If he tried to undo the previous curse in Millie's body, he would be able to finish it within three hours.
The second thing he learned during this trip was the knowledge that the God of Mischief shared with him. Knowing his goal was enough to make Theo work even harder, considering there were many more plans he needed to make in order to do what he truly wanted.
Last but not least, his Perfect Control. Although he finally stepped onto this stage, he still needed to practice until he could master Perfect Control.