Arc 2Sabaody and Marineford
Arthur built the Don Stallion, fought the Supernovas and Kizaru at Sabaody, and joined the Marines as a Shichibukai for the war at Marineford. He defeated Jozu with Excalibur, leaving the enraged Whitebeard to confront him.
- Arthur found that the Holy Lance had boosted his strength and Observation Haki, then took Nami and Robin to Shandora, where Robin read the Poneglyph and Roger’s message.
- Arthur sold the treasure in Water 7 and commissioned Franky to build the Don Stallion, then sailed away with Nami and Robin after two months.
- In the Florian Triangle, Arthur struck Thriller Bark with lightning, while Nami read news about the Straw Hats and their Enies Lobby incident.
- At Sabaody, Arthur obtained Vivre Cards from Shakky, defeated Urouge and Apoo, and began hunting the other Supernovas.
- Arthur fought Kizaru to protect the Straw Hats’ escape, then concealed his role in the Celestial Dragon’s death as news of the killing spread worldwide.
- Arthur joined the Shichibukai at Mary Geoise, where he crossed swords with Mihawk, before Sengoku revealed Ace was Gol D. Roger’s son and the Whitebeard Pirates attacked Marineford.
- At Marineford, Arthur defeated Jozu with Strike Air, then fought Marco as Little Oars Jr. was struck down and Luffy arrived with allies and prisoners from Impel Down.
- Arthur killed Jozu with Excalibur, and Whitebeard leaped into the battle as Sengoku warned the forces that the enraged Whitebeard was coming.