Iroha's moves (they are all magical).
Amatsu: Fuga: Light based AoE
Amatsu: Kyori : Light based AoE
Amatsu Hanadoki : Light based ST + Dispel 1~2 buffs
Amatsu: Suien : Fire based ST + Defense Down + Magic Defense Down
Amatsu: Gachirin : Fire based ST + Attack Down + Magic Attack Down
Amatsu: Choun : Fire based ST + Evasion Down + Magic Evasion Down
During Meikyo Shisui she does Kyori > Hanadoki (Frag) > Suien (Light) > Gachirin (Light) > pop Dia (50 hp/tick) or MDB down aura which remains until the next SP. She SP every 2 min.
Her macc is low, it's possible to resist everything with Attunement/Light Carol/Barfira/Nocturne.
She has 1.8~2m HP, the others have 900~1.2m HP.
Like in Dynamis Divergence, they take reduced damage from repeatedly using the same WS/BP/nuke. The nerf potency has 5 stages (for BPs/nukes at least): 100%, -10%, -25%, -40%, -60%. They have DT-50%~ too.
Arciela doesn't summon Naakuals.
Prishe uses Hysteroanima (unsure of the effect) and can cure herself for 100k (edit: Nash can Cure, not Prishe).
Nashmeira spam that horrible Terror attack, I wonder if it can be resisted?
They are all stunnable.
They resist Mewing Lullaby.