Teenager

Once he was sure that all of them had gotten used to the concentrated azure field within the palace, Lex took a step forward. Just as he anticipated, the concentration of the field grew stronger after a single step, thus increasing the spread of his rash, and would continue to get stronger until they reached the very center of the palace.

He did not know if this was meant to be some kind of test - to see how far they could come, or if they would opt for the easier option of the hazmat suit - but he personally had no intentions of stopping. Since the danger wasn't immediate, and the damage wasn't permanent, he was more than willing to use this as an opportunity to train.

It was because Lex never let an opportunity to grow stronger pass him by that he had accumulated so many advantages. If he needed to suffer for it a little, so be it. If he needed to suffer for it a lot, then he'd endure that too. That was in no way an acknowledgment of him being a masochist.