Haki, a mysterious spiritual energy that allows ... After fending off Whitebeard, he struck Portgas D. Ace with a magma fist. Fatally injured, the young pirate died in the middle of Marineford.

On the contrary, Luffy yelps in pain after punching him and his Haki-coated fist appears to be trembling from the pain of the impact. While Luffy has had trouble inflicting damage on the Five ...

Each has unique abilities like Haki and Devil Fruits ... and this technique essentially saw him create a fist as big as an entire island and then bring it down on the Yonko.