DFFOO [JP][Test] Railcannon Aerith
Just a fun little test with Aerith's limits.
My initial diagnosis is ... the off-turn attack from Holy is not limited by HP dmg cap like Sherlotta's piggy bank Chug staff. My assumption is it can reach 999,999 if you really try for it.
HP dmg up (buff)/HP dmg taken up (debuff):
It is actually very efficient to stack HP dmg up or HP dmg taken up debuff on the enemy to raise her off-turn dmg. Here I tested it with Lufenia without the extra bit of HP dmg reduction on Shinryu, but when you pop your FRs you actually get extra HP dmg up to compensate for that.
Normal use/Specialized use:
You can quite comfortably get her Holy off-turn to deal around 550K-740K ish dmg if you have 3 BT characters with HP dmg up auras. If you are really going for it with the CAs, friend unit and Ifrit buff, then this can happen. If you get the FR% to 999%, this is pretty much a free 9.5m-10m dmg that every party member can trigger.
Other interactions:
This attack can take those "additional HP dmg" addon effects as well. Therefore you can throw in Jack G's -BRV, Ashe's Queen's Order, Lunafreya's heavy buff or Iroha BT into the mix for extra dmg.
I don't think Leo's buff works though since the attack is designated as a full AOE HP attack.
The good thing is, since she does not actually need her turns to fire the attack, you can turn hog with others or let someone else go into BT phase and preserve those precious buffs like Ifrit, Queen's Order, both Lunafreya's buffs (swiftness also has HP dmg up on it) or HP dmg up calls like Prishe's.
For your reference, here are the used buffs/debuffs:
Kurasame CA (missed one stack here unfortunately)
Seymour LDCA at 3 stacks
Prishe LDCA on Aerith
Aerith/Serah/Ramza buffs and BT
Lunafreya buffs on Aerith
Ifrit summon phase and HP dmg (cap) up buff
I have done a video with Jack but it is probably best to release it later in the week so you don't get overwhelmed.
I can't wait to test this once more with Quina BT and see if there is a special interaction with it.