Arc 6The Strongest Man and Four Kings
Arthur defeated Whitebeard at Decalvan, inherited the title of World's Strongest Man, and awakened Avalon before entering the Fourth Holy Grail War as Lancer. In Fuyuki, he clashed with Saber and Gilgamesh, then joined the four kings’ banquet as their debate over the Grail began.
- Marco persuaded Whitebeard to contact Gemini, while Blackbeard tried and failed to recruit Doflamingo into an alliance against Arthur.
- Arthur challenged Whitebeard at Decalvan, where Bartolomeo joined Arthur’s side and defeated Ace before Arthur and Whitebeard fought alone.
- Arthur and Whitebeard exchanged devastating attacks until Arthur pierced Whitebeard with Rhongomyniad, and Whitebeard died standing after declaring he had no regrets.
- Blackbeard arrived to attack the exhausted Arthur, but Arthur escaped with Whitebeard’s corpse and later gave it to Marco before returning to Dressrosa.
- After six months away, Arthur entered the Fourth Holy Grail War as Lancer, gained new system abilities, and met Saber in Fuyuki.
- Arthur fought alongside Saber against Gilgamesh, who retreated after Arthur injured him and Tokiomi used a Command Spell.
- Arthur, Saber, Gilgamesh, and Iskandar gathered at Einzbern Castle for a banquet, where they debated their claims and desires concerning the Holy Grail.