The Maelstrom Spider Pirates are a New World crew captained by Squard and allied to Whitebeard. Once wiped out by Gol D. Roger and rebuilt by their lone survivor, they fought at Marineford, where Squard infamously stabbed his adoptive father.
Headed by Squard, this band serves beneath the Whitebeard Pirates as one of their allied crews. Their emblem depicts a spider whose lower body trails into a spiral, likely evoking a whirlpool, with the front two legs raised as though reaching out. Squard wears that same mark inked across his forehead. Having earned his captain a name in the New World, the crew is presumed to be strong by the time of the great war.
The crew sails a vessel named the Real Spider, though its design has never been shown and it may not even have been the ship used during the Marineford war, where they were only seen aboard one of Whitebeard's craft. The crew's roots are tragic: more than twenty-four years earlier an earlier version of the Maelstrom Spider Pirates was slaughtered by Gol D. Roger, leaving Squard as the sole survivor. That loss bred a bitter hatred for the Pirate King, until Whitebeard took the grieving man in as a son and gave him the confidence to assemble a new crew.
Squard is the crew's heart and the focus of its story. At Marineford his crew stood among forty-three New World outfits backing Whitebeard against the Marines. Admiral Akainu deceived Squard into believing Whitebeard had sold out his allies, and in a rage Squard stabbed his adoptive father. Whitebeard forgave him all the same, breaking him down in tears, and on Marco's urging the crew fought on for their captain's sake. They later tried to seize a paddleboat to cover the Whitebeard Pirates' escape, were ordered to retreat instead, and wept when Whitebeard fell to the Blackbeard Pirates.

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At the Battle of Marineford, Admiral Akainu tricked Squard, captain of the Maelstrom Spider Pirates, into believing Whitebeard had sold out his allies. In a rage, Squard stabbed his own adoptive father, though Whitebeard forgave him afterward.
Squard is the captain of the Maelstrom Spider Pirates, a New World crew allied with the Whitebeard Pirates, and he came to see Whitebeard as an adoptive father figure.
More than twenty-four years before the present story, an earlier version of the Maelstrom Spider Pirates was wiped out by Gol D. Roger, leaving Squard as its sole survivor.
The crew's Jolly Roger shows a spider whose lower body trails into a spiral evoking a whirlpool, with its front legs raised as though reaching out, a mark Squard also wears tattooed on his forehead.
Yes, the Maelstrom Spider Pirates were among the forty-three New World crews that fought alongside Whitebeard at the Battle of Marineford, and its crew wept when Whitebeard later fell to the Blackbeard Pirates.
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