Sebas - Could punch through Climb's sword

Like an arrow released from a fully drawn bow, Sebas’s fist zoomed forward with a roar of ripping air.

This is instant death. Climb sensed it in slow motion. His mind was seized by the perfect image of death—an iron ball much taller than he was zooming straight for him at a furious speed. If he shielded himself with his sword, the fist would smash through like it was nothing.

***

Volume 5, Chapter 4.2