RUN BRD (me), COR COR DNC WHM
Kill order is Iroha 1 > Lion > Arciela > Lilisette > Prishe > Nashmeira > Iroha II
We had outside BRD SMN SCH in the beginning to help out..
Outside BRD did SV Minuet 5-3, Honor March
The second BRD did Light carol x2, scherzo, minuet2 (not soul voice)
SMN did Crystal Blessing/Hastega II
SCH did Voidstorm II/Embrava(pointless kinda)
On Iroha I, we started off with Armor break, Dark Threnody II then this 6-step SC:
Leaden > Savage > Rudra > Last stand > Leaden > Rudra
Used Tenebrae Gambit/Rayke > Random deal x1-2 > reapply Gambit/Rayke
Once other girls showed up, BRD did Preludex2 for the CORs, who attacked from afar while we fought Lion and did this SC:
Last stand (fomalhaut) > Leaden (death penalty) > Rudra > Wildfire (Umbra)
BRD just sat next to the DNC and sang Madrigals/Honor over and over everytime Lion did the dispelga move. Majority of dmg comes from Leaden / Gravitation / Umbra here.
Lion should die before other girls wake up.
Once Lion is dead, BRD can then use Soul voice + clarion call and sing Honor March, Madrigal, Minuet5-4 and Fire Carol 1
WHM should do barfire / baramnesra so you can resist Arciela's amnesia move.
As soon as BRD does Soul voice, CORs should use Wild Card to attempt to restore it back.
From this point onwards, all DD should maintain the 5 songs from clarion call.
Fight Arciela using the same skillchain on Iroha 1, and continue using this same SC on other girls in the kill order mentioned.
RUN used Armor Break, Tenebrae Gambit/Rayke whenever its ready, BRD kept Dark Threnody II on, WHM did frazzle and impact whenever he got the chance.
Soul voice songs should wear as you engage Nashmeira, at which point we choose to continue using normal songs until we engaged Iroha II.
We fought Iroha II many times, and without GEO, we concluded that these are the ideal buffs necessary to survive:
if Soul Voice is up, use Honor March, Madrigal, Minuet 5-4, Light Carol 1, Magus roll
if Soul Voice isn't up, use Honor March, Madrigal, Minuet 5, Light Carol 1, Scherzo, Magus roll
CORs had the new Lanun Knife (-16 DT with 4 rolls) in addition to -10 MDT ambuscade cape to maintain -26 MDT at all times (including ws time)
We had BRD and WHM sit close by to reduce the damage from Firaja. She likes using Firaja > Amatsu: Fuga to kill someone.
RUN must use Tenebrae x3 Valiance for the DD, when that wears off, use One for All. Use Gambit/Rayke before swapping back to to Unda x3 and Vallation to survive the Fire 6 M.bursts.
She alternates between M.def down / and Dia aura as mentioned in this thread before. RUN tank must maintain Barfire / Fire Carols x2 / Unda x3 / Vallation at all costs when M.def down aura is up.
If Dia Aura is up, it is actually safer to swap to dark runes and apply Valiance and Gambit/Rayke.
RUN can save SP / SP2 for whenever he is caught in dark runes or missing Shell or Carols while M.def down aura is up.
In the run we won, we had soul voice restored 3 times successfully, so we had soul voice for the entirety of fight time with Iroha II (32min). Despite that, DNC ended up pulling hate and dying at 10%~ and then RUN got one shotted, so we had to sleep her and wait 3mins for weakness, that is why I think with this strategy you need at least 2 successful soul voice restores if no other mistakes occur.