Lex had only managed to overcome the corruption and madness of breaking his oath by going to Slime Paradise.
The natural powers of the place had been enough to suppress the rot and decay of Lex's psyche. Over time, Slime Paradise purified Lex of that corruption.
Now that he realized that his Prince was still alive, the power that he had gained from becoming an Oathkeeper and Oathbreaker merged together and allowed him to reach the peak of Rank 8.
Very few individuals in the world would be able to defeat him now. And, those who could would have to sacrifice themselves in a pyrrhic victory too.
"I will now all bind you with an Oath," Lex said coldly as a dark-red mist oozed out of his body. "Break it and your souls will cease to exist."
The dark-red mist then forced itself inside the teenagers' bodies, making them squirm on the floor and clutch their chests.
