After facing the first Kraven, the challenges of the tower once again returned to those of combat, and they quickly became genuinely challenging. It was no longer a matter of one or two hits, but rather of a fight.
The Kraven, who had become his constant foes, proved themselves to be extremely worthy of the exceptionally deadly reputation they had in the Crystal realm. Soon, not only did Lex go back from being able to defeat them easily, but he even went from being on the offensive to being on the defensive.
For a moment, Lex even considered just ending the trial there and then. It was not like he was interested in the reward, and more importantly, he didn't want to waste time here. He had other things to do.
But his instincts warned him otherwise. Since he was already inside the tower, his instincts were no longer being interfered with. It was not that he would be in danger if he tried to quit or didn't finish the tower, but rather that he would regret it.