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got a reliable way to deal with the 4k needles spam?
THF, WHM, BLU, BRD, BLM, and either a NIN or MNK. If you go with MNK, have THF sub NIN.
This is pretty much the best setup for any +1 seals, but it's more of a requirement for this boss. You have all yellow procs covered. You have highest TH. You have stuns from BLM and BLU. You have AoE heals from WHM. As long as your WHM has AF3+2 legs, mana will never be an issue.
If you have MNK instead of NIN, let THF evasion tank at first while you get proc. It's way easier to get the hint and proc when NM health is high. Once you proc, full attack. WHM should only have to single heal THF while looking for proc. After that, should only be using AoE heals every time NM uses needles. BRD sings double march and keeps haste on everyone. Can find hint quickly by spamming threnodies. BLU should have both sudden lunge and head butt set. When NM is below 50% he should be stun locking NM. BLM can use stun as a backup. With double marches, NM should go down pretty dang fast (depends on gear).
Basically the idea is that even though he can and will use 4k needles back to back multiple times, he should never be able to get off more than 1 before your WHM has used Curaga and got you all back to full health. He might get off 2 if a stun is missed, but even 2 back to back is only 1333 damage to each person.
Anyway. I've also done the fight many times without the ideal setup. IE - WHM, BLM, BST/NIN, BST/DNC, BST/DNC, BST/DNC. You won't guarantee yellow, and your TH won't be as good, but you can rotate 8 stuns, and even if you can't stun, you have 10 bodies to soak up needles. NM won't die as fast either, but that shouldn't matter.