
It is not known if the name of this sword played a part in Roger's naming decision for his son. Rouge, with Roger having specifically chosen Ace as the name were the child to be a boy. When Ace was ten years old, he knocked out most of the Bluejam Pirates with his Conqueror's Haki.

It was first seen used against Kozuki Oden, hitting him in the torso with a burst of dark lightning-like energy, and was powerful enough to overwhelm the samurai's two-sword defense, sending him backward a great distance. Kamusari ( 神避 ( かむさり ), Kamusari ?, literally meaning "Godly Avoidance" or "Divine Departure"): Holding his sword in his right hand, Roger imbues it with Haoshoku Haki and then swings his sword horizontally, creating a powerful Haki imbued slash attack to strike his opponent.Roger frequently imbued the sword with Busoshoku as well as Haoshoku Haki. It was used by the Pirate King Roger during most if not all of his great exploits, from the God Valley Incident to his battles with Whitebeard, and was never shown taking any damage, which served as proof of its immense durability.

Abilities Īs one of the 12 Supreme Grade Meito, the quality of Ace's blade is ranked among the best, being one of the most powerful weapons ever created, rivaled only by a select few other weapons such as Whitebeard's Murakumogiri. It possesses a yellow hilt with diamond shape pattern, a golden guard, as well as a thinner hand guard running atop the hilt and a black sheath. Ace is a normal-sized cutlass with a slightly curved blade, with a saw hamon pattern adorned on the sides of the blade.
