However, Haki is at the core of the strongest bunch of them. Specifically, two characters within the ranks of the Strawhat Pirates utilize Conqueror's Haki. That said, this might not be enough.

The strongest Haki, that is, Conqueror's Haki, will be required to take them out, and the Straw Hats need as many conquerors as possible. While Luffy and Zoro already have it, Sanji is now set to ...

Advanced Conqueror's Haki has, so far, proven to be the greatest power in all of One Piece, as even Joyboy was able to infuse a knot within Emet that remained just as potent after 800 years.

Meanwhile, Rocks had already defined an age. It is said that when Rocks infused his sword with his powerful Conqueror's Haki, each hit felt like a blow from a hammer or cannonfire instead of a cut.