At the start of One Piece, Ace was cut down with a single slash

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Accidentally reincarnated into the world of One Piece, he became one of the four little brats under Garp. After freeloading drinks for fourteen years, he activated the strongest template system. Unlocked the Ontology Template - Kenpachi Zaraki, the King of Slashing. Assassin Wu Liuqi, Hollow White, Sasakibe Sajin, Killer Bee, Executioner Himura... A series of templates were combined together, and the strongest battle maniac, the King of Slashing, was born.
Ace: I'm Ace. I really wasn't cut down by someone with a single slash. I swear in the name of Whitebeard's adopted son.
Zoro: I've heard that all the members of the Thirteen Court Guard Squads are powerful sword-wielders. I, Roronoa Zoro, will definitely become the strongest one.
Hawkeye: My sword has never been broken, but starting from today, I'm going to sheath it for good.
Kaido: I'm the strongest creature on land, in the sea, and in the air. The bandages wrapped around my body are just because I'm feeling too cold.
Blackbeard: His sword isn't heavy at all. It's just that after doubling its weight, my legs went numb and I couldn't move.
This world was never peaceful in the first place. When Bai Yu unlocks his Ontology Template to one hundred percent and combines numerous characters together, this world will be shattered beneath his feet. There's nothing in this world that my sword can't cut through.