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...you just debuff him!

Final W Sigma was implemented as way overtuned. When the phase number went up, so did his damage dealt and his defense, up to the point where player's with a much lower attack bonus wouldn't be able to deal more than 1 damage per hit anymore.

And of course, his damage. Enough to 2-3 shot you in case of no damage resistance. Characters with strong sustain are pretty much the way to go.
But, there is another way, and that is to debuff his atk so much, that he actually deals little to no damage.

It requires a couple things. The Valentine's Day Card which drops the Atk of a Boss by 40% once during the battle (it's duration is about half the fight)
Swimsuit Iris "Cute Bathing Suit" passive will also add 6% damage reduction which stacks up to 4 times everytime you hit with something.
Then Glittering Spark will add 27,23% Atk down with it's Armed destruction passive. And lastly, the Mad Nautilus Chip on it will drop his Atk by another 30,63%.

Since this build focus solely on survival, it's obviously not going to win the topspot in terms of contribution, but it does what it is supposed to.

BGM used : Puzzle Plank Galaxy - Super Mario Galaxy 2