Ok, so basically Rain is in your party for Leadership buffs? Why not use Cecil instead? Build his LB up before fighting Abraxas, then use his LB on the first turn. After 3 turns if you need those buffs, you can use Refia's Embolden together with Cecil's Focus.
Also, why is Rosa in your party? Any vital role she's covering? Or just another healer? If just to heal, Cecil could cover as the secondary healer too.
You're only damage dealer is the double double Meteor?
Come on GAF, let's help Valentus brainstorm this.
Basically my strategy for the whole fight is:
The basic strategy is:
Rain: Leadership, normal attack to chain meteors
Refia: Heal, full life, emergency embolden if rain dead
Rosa: Blessing (very important because they are 7 bosses), heal, emergency esuna (as a side note, i tried Cone Fina too, with great results)
Tilith: Rainbow Veil, use her heal that also cures status.
Exdeath: Double Meteor (basically... just that xD)
Friend Exdeath (need more exdeath friends gaf!, please!)
The specific strategy so far:
Manasa: 3 chained double meteors, dead (also, before dead, i use the double osmose "trick" (or bug?) to replenish both exdeaths MP)
Huitaca: Same as manasa, nothing to see here.
Neith: Rainbow veil, leadership and bless always active. Curaja and Tilith heal to keep hp always in 100%. Kill with meteors. Too easy, moving on
(My inventory is: ether, turbo ether, mega ether, chocolate, elixir, phoenix down, unicorn horn (stone), vaccine (disease), phoenix down, tent. After the 3rd battle, my ethers and turbo ethers are gone)
Cagn: His attacks even with buffs are too much. But, that mantis doesnt do elemental damage, so what i do is using Tiliths buff (last 2 turns) and Rain use provoke. That way the mantis only focus on rain. If rain dies, doesnt matter, i can revive him when the battle is over (god bless is a exploration event). With 4 chained meteors that thing is down. Moving on)
Herne: Skipped it. Fuck the fake doublicorn (but i will feel terrible if i clear the event without killing all the bosses.... But my MP resources isnt enough for 7 High MP-consuming battles)
Limnad: The big problem of this motherfucker: Osmose. Every 2-3 turn she does osmose on a random enemy. I tried to cast carbuncle to reflect the first osmose at least, but the fucker always cast a spell (waterga or aeroga) before osmose, and that spell breaks the reflect. Anyway, the first turn i do:
Leadership
Rainbow Veil
Bless
Double Meteor
normal attack with refia
The second turn (the osmose turn) i call provoke with rain, so try to focus on limnad osmosing Rain, but then tilith will have to do rainbow veil and buffs... anyway, all my chocolate is gone in this battle, but i managed to win.
Theres only the elixirs and the mega ethers left... before the final battle i use the tent for full heal:
Abraxas: I can endure the damage, the swallow skill (2 units dead) is the one that is fatal to me. And thats it, i can analyse much more this battle because i dont last long after the 2 insta deaths.
Tilith, Refia and Exdeath are off the discussion for replace. I need those 3 100%
What choices i have in mind to replace:
Ling
Cone Fina
Luka
Cerius (maybe a good replace for tilith? But tilith's heal cure status, and this trial is status-ailment heavy, so i dont know...)
Cecil
Also, the only equip that prevents insta death are the Angel Earrings (Freya TM) so thats not an option too.
I feel im so close, and only 1 skill is preventing me to make the miracle again.
Edit: Lyrian, i love you. That will help me in my analysis!