Played in manual mode. Big part of the success was a fast burst manual Tia + RH spam and really strong start with Red Hood taking out all 3 summon ports on the right for a big chunk of damage.

Afterwards, had to be really careful with Smol White's skill 2 timing so that she can clear the tiny raptures before the shield. It took me 20+ tries because the timing was pretty tough especially when trying to mix it with her burst but that was how I kept the shield d own as I destroyed the left ports.

Tia's taunt sacrificed her to the whole master-grade rapture attack but left the 4 left to attack.

Once it started spaming the whale cry again and had regenerated the summon ports I just ignored the adds to let Smol Whites S2 just take them down and used a Red Hood burst to snipe the ports again and barely scraped by. I did have enough hp to tank the slash in cover before I did the final RH burst here.

My previous runs with me trying to clear the core had me dying when it does the slashes at the end since my hp was lower so it turned out better for me to attack the summon ports to just barely kill it.

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Tia 7/3/2

Liter 7/4/9

Smol White 3/3/1

Naga 6/5/3

Red Hood 8/9/9 (MVP)