When Pen heard Ace's confident words imbued with heavenly thunder law and killing intent, even someone like him who stood at the pinnacle of the world felt his heart churning.
If he hadn't experienced the heavenly thunder himself, he might've already attacked Ace because of his arrogance. Now, he was really confused about whether the heavenly thunder was natural or Ace was an old monster like him.
Furthermore, one of Ace's thief titles, [Cold Liar], was also in effect, which made Pen sink even deeper into Ace's deception.
Now, he would attack while keeping in mind that if he failed, he might die, and this result was exactly what Ace was looking for.
"Please forgive my previous transgression. I was way out of line because I never met someone like you before, and I no longer wished for us to fight." Pen tried to hide his fear as he sternly stated while secretly circulating his Qi just in case Ace turned out to be as unreasonable as himself.