All missions done, this was annoying. Depending on the RNG to get those Summon Crystals was a torture.
I guess these puzzle fight will be the only way to balance the game from now on.
I didn't even bother with the LB mission, will revisit that at another time.
For the non one shot run I took:
Orlandu - Odin - with genji blade and save the queen. 972 atk, kept spamming cleansing strike to build LB and Esper
Trance Terra - ramuh - elemental coverage and resists. Ensured she had 4k+ hp and 830+ mag. Kept up her +30 ele resist and used Chaos Wave unless he was weak to a specific element which I'd exploit.
Yshtola - carbuncle - for heals 4.5k hp. Having healer with auto refresh is so god damn awesome and really exploits the fact that Refia's days are numbered.
Minfilia - no esper - for resists 4.5k hp. Honestly I could have replaced her with someone else because you have no god damn clue what resist to keep up as kefka is all random. If I could replace her it'd be with another healer such as Luka for clense.
Cecil - diablos - with dual cast and 8k hp. Need to get this guy that Trance Terra TM for the dual cast and mp +30% or get him some form of auto refresh. Wouldn't be necessary if using 2 healers however.
Friend Trance Terra because why not lol.
Mana was and wasn't an issue. If I noticed someone was getting low on it I'd have to pop a pot but pots are limited and trying to do this shit at work and losing count of how many turns I was at made it more difficult that it had to be.
Truth be told like any of these endurance fights you do NOT need 5* bases. I could have seen myself doing this Cecil, Snow/WOL, Refia, COD for ele resist, a 5th of your choosing and a friend unit for dps or mana regen.