Final Fantasy X - Yunalesca (Ability Nodes Only, No Items/Overdrives/Summons)

M A M U D O O N

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Lowdown on the restrictions of this challenge:

Ability Nodes Only (ANO) - You can only activate ability nodes, no raising characters' stats in anyway.
Own Sphere Grid (OSG) - Each character may not leave their own section of the sphere grid. Note that these rules combined mean you can still use key spheres to e.g. teach Lulu Doublecast, Yuna Auto-Life etc.
No Summons (NS) - Self-explanatory, Aeons are OP meatshields
No Overdrives (NO) - Mainly for getting rid of Rikku's Mix, which is ludicrously OP
No Items (NI) - No using items, in or out of battle. Chakra Drops, Revival Beads, Megido Rocks, all those classic FF staples are banned (you can still customize equipment though)

Initial equipment:

Tidus: (First Strike) + (Defense +10%, Berserk Ward, HP +30%)
Yuna: (Magic +10%, Magic +3%, One MP Cost) + (SOS Regen, Zombieproof, Confuse Ward)
Rikku: (First Strike, Initiative) + (HP +10%, HP +5%)
Lulu: (Magic Booster, Magic +10%, Magic +5%, One MP Cost) + (SOS Regen, Zombieproof, Confuse Ward)
Auron: (Piercing, Strength +10%, Sensor) + (Zombieproof, Deathproof, Confuse Ward)

Once again, Sentinel comes to the rescue. Her regular physical attack dispels most buffs, so make sure Auron is constantly guarding while you set up. Lulu and Yuna want Haste, Protect, Shell and Focus x5, while Auron wants Regen. I had Rikku and Tidus Haste/Cheer themselves for later on too. Don't attack her with Holy during the first phase or Yuna will be silenced permanently.

The 2nd phase is really easy if you set up properly. She'll mostly just spam Hellbiter which doesn't do much to a Zombieproof team. I actually re-used the SOS Regen armours I got way back for this fight which speeds things up a little, but you could cast Regen manually or heal with Pray.

The tricky part is the transition to the 3rd phase, as she immediately opens with Mega Death. Customising a whole team of Deathproof armours would be very expensive at this point, so it's best to have some reserve members who are zombies. This requires some precise timing - get Lady Y as close to 0 HP as you can, then bring them out to get struck by Hellbiter before finishing her off (this is why I buffed their strength at the start, in case Lulu couldn't get close enough with just magic)

The combination of Shell, Focus and Confuse Ward should take care of Mind Blast in the third form. Mega Death is mercifully predictable. It comes every 5 turns, so bring out your zombies when you know it's coming then send them on their way again. All in all, a surprisingly simple fight.