Ace for DPS, Sherlotta for free turns, HP dmg up & batteries, Serah for debuffs, buffs & batteries.
My Serah is pretty weak here due to her only having 1 perfect artifact hence her auras will not be that strong. Whoever thought up of that 0 or less HP damage taken requirement is a sadist, I have to redo my run to achieve all the requirements.
I prefer to go about saving Ace's abilities till the final wave but spend 2 to 3 to speed up the trash wave clearing.
At the final wave, have Serah & Sherlotta apply their debuffs on all bosses to control their brv. One boss will go into 'Steam Mode' which will speed up its turn and become more aggressive. Watch out for the eventual all attack (Steam Burst), likely Serah will not be able to recover her HP in time to achieve the HP requirement unless with Ace's Blue Card buff up. (Might not even reach full HP with this)
At the 50%HP mark, the bosses will target themselves to go into 'Steam Mode' together. This is the time to bring in your friend support and summon. Have Sherlotta's HP dmg up buff ready when summoning and have both Aces use all their Spiral Combos during the summon. When one boss falls, the other will automatically enrage, be immune to debuffs & speed up tremendously. Try to finish both bosses simultaneously or the next boss to fall by the next turn.
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