Cid Mission'd Ahriman.
Set Up was:
Basch: R3 Saint's Cross, R4 Banishing Strike, Pride of the Red Wings
Vaan: R2 Thief's Revenge, R4 Power Breakdown, One Eyed General (he has Pyroclasm SSB)
Gabranth: R2 Magic Lure, R2 Protectga, WoL's Physical -> Holy Damage RM
Penelo: R2 Multbreak, R4 Heathen Frolic Samba, Mako's Might (Intercession SSB)
Larsa: R2 Shellga, R5 Curaja, Dr. Mog's Teachings
RW: Shout
Gabranth is twinked for pure defenses, though he does have that 5* FF12 Dagger so with the RM, he can add a bit of damage from time to time (just under 4k, not great, but every bit helps.) With the buffs and debuffs in place, he's taking on average 500 a shot. Larsa plays healer, because Penelo's busy dancing. He has a Soul Break RM because I want him alive through the first Maser's Eye and insured to having a full gauge by then is not insured, so I fire off Blink Strike at the right time, he survives. Than you Magic for reminding me that is a thing...for all that the winning run it didn't matter (he got physicaled, survived Maser Eye! ...only to die to Poison immediately after -_-.) Penelo can sometimes heal with her Soul break, and Intercession w/ her own Rod is about an extra 11k damage. Basch is damage capping every strike after Shout, so use Saint's Cross until runs out, then Banishing Strike. Given eh's my DPSer, I want every one of his hits to matter, so he also fires off Shout both times. Vaan is Power Breakdown because every little bit helps, and Thief's Revenge to alleviate healing from Larsa a bit, and extra DPS (got his level raised that he can hit 5 times w/ Synergy.)
Shout was used immediately, and right after Immobilize. My team's DPS was high enough (especially since Vaan can reset the buff on himself) that it wasn't necessary for more.
Failed strategies prior!
-The Hope RW one. Particularly because no Hastega means only Ashe can really act thanks to the RW, and yeah, not a position I want, and I didn't feel like I could spend turn slots on Haste.
-A similar strategy to the above but with Fran (who has her Full Break SSB) over Vaan. She has lower DPS outside of her Soul Break, and that was the selling point. I thought having another Full Break reapplied would help alleviate some of Penelo's issues, but turns out this was problematic. Also, Vaan could more easily equip a +Damage RM thanks to Soft Cap, a little harder to do with Fran using a Bow.
Annoying fight, glad it's over with, I even won with only one Medal loss!
Haven't touched either new event because I want to maximize Gysahl Green doubling. I know there's time after that ends to do them so...