Spent yesterday getting Reberta to 100 so I could do the trial.
Refia (Aura Staff, Cat-ear Hood, Great Mage's Robe, Domination Ringx2)[Dualcast, Spr+10%, Hp+15%, Shard of Genius]<Golem>
Reberta (Crimson Blood, Vernard, Imperial Helm, Demon Mail, Ifrit's Claw, Ruler's Ring)[Dual Wield, Dark Knight's Soul, Power of Creation, Atk+30%]<Odin>
Sakura (Golden Staff, Chapeau, Siren's Robe, Domination Ringx2)[Hp+15%, Hp+15%, Hp+15%, Spr+10%]<Titan>
Seven (Empress Birch, Soul Crown, Tabby Suit, Muscle Belt, Unusual Artifact)[Insult to Injury, Follower's Oath, Follower's Oath, Follower's Oath]<Carbuncle> - yeah I was lazy with this one, just grabbed her from Arena setup
Friend Marie
So it was a sloppy fight with several deaths. Sakura was more of a hindrance than help due to squishiness, although I'm pretty sure her Defensive Barrier helped Refia survive Maelstrom+Megaflare cheese (145 hp left, phew). Refia was MVP, with Focus up she could survive Megaflares without defending. This let her keep up everyone's hp.
This boss is pretty cheap, doing damaging attacks on the same turn as charging up. You really need a healer that can facetank Megaflares.
Reberta did well as solo damage dealer. Actually a little too well, passed 50% and 40% on the same turn which led to Maelstrom+Megaflare charge simultaneously. She did die once though to element spamming. I put Vernard on her instead of a stronger sword so she could take advantage of fire debuffs from Seven or Marie.
Had to slow down at the end to get esper charge. Got the boss to about 15%, put all buffs up, and then killed the next turn with Titan+Reberta.
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The trust moogle was the last I needed to finish Excalibur. Now I need to work on another Dualwield, because I have too many physical dds.
Also been practicing chaining on Bahamut Elite. Best result was a 29-hit chain for 10.4m damage.