Sophitiomon was a prosperous city with great value for the whole TIRTANYA world. For that reason when the world was free from the threat of destruction and even the hero who had managed to defeat the DESTROYER had also vanished, Dmitry Agapov thought that this was a great opportunity for him to rise.
He immediately took control of the whole Sophitiomon city. As a very important city, by taking its control, he would be able to get his hands on a great amount of authority and money. And as a level 999 individual he already had an insane amount of power. So very soon he started to rule over the city of Sophitiomon like a tyrant and no one was able to do anything.
When he heard Elena's declaration he immediately activated all his magical treasures which he had managed to get after he started ruling over Sophitiomon. He was very confident that even Elena would have a hard time defeating him with all these magic treasures even though she was the hero.