After Zhang Yi exited the tower where he was, an energy type tried to cast a mark that looked like a monster worse than the demon, that energy circulated all over the floor before it dissipated.
Zhang Yi had been lucky to be cautious and get out of the tower because that mark was the representation of the enemy of demons, was a kind of honor for some warriors, but it was actually a great curse because when demons came back into the world they would strike first with all the force who had these marks.
After Zhang Yi left the tower a short time passed and the tower unexpectedly exploded and completely disintegrated, it seemed that the creator of the tower did not expect the killer of the demon to come out of this tower alive and wanted to make sure to annihilate his soul demon that Zhang Yi had already made.