The Legendary Conqueror's Haki

Yes, without a doubt, that peerless, overwhelmingly tyrannical power emanating from the Holy Sword was the legendary Conqueror's Haki. This unique trait made the Holy Sword an exceptionally rare treasure. Only those born with the talent for Conqueror's Haki, or those who had already awakened it, were qualified to possess and wield it.

If someone without Conqueror's Haki tried to hold the Holy Sword, they would face unbearable consequences—they would instead be controlled by the Holy Sword and become its loyal puppet. Fortunately, Moke possessed an even stronger Devil Fruit ability, allowing him to contend with the Holy Sword and avoid the fate of being controlled.

It was worth mentioning that the trace of Conqueror's Haki attached to the Holy Sword had not appeared from nowhere. It originated from the peerless king who had once wielded the sword. After countless brutal battles, that king had stained the Holy Sword with his dense Conqueror's Haki, as though granting the blade new life.

A similar example was the famous Black Blade Yoru from the world of One Piece, though there was an obvious difference between them: Black Blade Yoru was wrapped in Armament Haki, while the Holy Sword was entwined with Conqueror's Haki. It could be said that both weapons represented the pinnacle of their respective fields.

Furthermore, since this trace of Conqueror's Haki was ownerless, Moke could easily absorb it and convert it for his own use when he activated his Devil Fruit ability. But the most critical point was that once the Holy Sword fused into a person's body, it would swiftly achieve flawless harmony with them—the realm known as Man-Sword Unity.

At that point, the wielder's swordsmanship would improve at an astonishing rate, soaring like a rocket. Just like Saka in the original One Piece, after the Holy Sword