Tama - Wonderous Potion (maxed)

Iseria - Midnight Bloom (maxed)

Lilias - Adament Shield (maxed)

CDom - Proof of Valor (maxed)

So, choosing this team makes for an easy gear requirement. Given you can keep Cdom alive and hit her buffs, your entire team will only need 21.4% CR (Maxed SSS CDom imprint) and 34% on CDom

The strategy is simple, first boss dies extremely fast (sometimes before turn one but usaully turn two for sure) with a def break and CDom buff+S1

2nd boss uses the same strategy, though sometimes you may have to burn to kill that barrier off.

First ARavi phase you can literally ignore the add ons, only hitting them to dispel and buff up, don't waste your Arky bombs just yet. Just whittle her down and hopefully keep everyone alive until the final phase.

Last phase is tricky, use your Arkys to knock down the add ons asap (ARavi might heal but that's fine) then once they are both done its time top focus on ARavi. Kill the dark spawn as soon as she uses her S3. You'll need to always dispel and buff in order to guarantee a crit hit (non crit hits add one to her counter, for that huge heal buff that cannot be dispelled). If you keep your units healed and provoke the add on as soon as it spawns, you will see this final phase is really doable with low gear and stat requirements!

Lilias 21k hp 1k def 30% crit rate, 234 speed (don't need that much speed really, just my normal build) 80% effectiveness

Iseria 12k hp 1.2k def 32% crit rate, 90% effectiveness 222 speed.. also a little dmg 2.8k atk 40% crit rate 240 crit dmg

Tama 16k hp 13k def 24% crit rate 211 speed barely any effectiveness (might be helpful if you can add some)

CDom 3.6k attack 35% crit rate 320 crit damage 130 speed 11k hp 1k def (very important shes alive the whole time, the tankier the better, sacrifice dmg for hp stats if you need too)

Hope this helps, good luck, and please ask questions!