For those who are still struggling with this CoW, after a lot of theorycrafting on this fight and the new morgana rod, I was able to finally get rank 1 for the first time!

My team is a lot weaker than they usually are, but is quite failproof and the damage is quite enough (did ~3.1b)

Used for the fight:

Runda EX-3: Bit of resists, full hp/def

Lara Croft EX-3: Honestly really small part of the damage, can be swapped by anyone that can break DEF by 90%. Geared for provoke on base form and with Phoenix for self auto-reraise. Also had Morgana's 1 Rod (for those with trouble, you can do the fight with hide cheese, lots of videos around here)

Ling EX-3: Another unit that didn't really need to do much. Used for morale fill but she's quite behind the most used morale batteries, I didn't exactly had anyone else at EX-3 for it tho. If you have Cressnik EX-3 for example you can probably even drop Morgana's rod

Esther EX-3: The key of the fight. Full damage on normal form, stays on Brave Shift where she's equipped with Lion Saber until the burst turns. Important: She must cast every turn on brave shift her damage skill and her skill that grants counter to the entire party because...

Sylvie EX-2: Sylvie here imbues, gives insect killer and, most importantly, counters every turn even if she's not damaged because of Esther. That means she'll always raise and re-raise Lara, making sure she's alive on the burst turns.

And lastly...

Chizuru EX-2: I know she's new and not everyone has her, but Chizuru deals SO MUCH DAMAGE when bursting her LB. She's also bringing beast killer to the party (which Ling can do if you don't have her) and kinda loosened the amount of damage I needed to bring. Still, she kinda can be replaced by Wylk too, which also means you don't need to bring Lara and can use someone else like Skye to add on the damage.

Since my morale generation is really low with this team I had to go to turn limit. Used Sylvie's first magnus on turn 2, burst on turn 4 to get the boss to 49% HP. Then you have to wait 3 turns (boss buffs his def) until Chizuru's brave shift wears off, and another 2 turns for her BS cooldown, which means I used Sylvie's second magnus by turn 8 for a kill on turn 10. Had around 140% morale on turn 4 and it was ~500m more than enough to bring the boss to 49%, so if you can reach that without Morgana's rod its doable!

Wanted to share this since it gives a general team for those without a lot of EX-3 units that pulled for Chizuru to be able to rank 1 on this CoW!

Good luck =)

Post edit: Here's the turn-table for the sensible units:

The rest just adapted based on the fight needs (remove poison, filled morale etc). If you bring Skye or Wylk, there's a lot of setup room right there for both too, since I had to wait for a lot of turns until Chizuru's shift reverted.

If you use Wylk, it actually should loosen morale requirements early in the fight, since you can burst on turn 7 to bring the boss to 49%, wait turns 8 and 9 for his buff to pass and then burst again on turn 10, since Wylk setups quite fast (turn 7 - BS magnus, turn 8 - fill magnus charges with his other magnus, turn 9 - shift back for fist imperil, turn 10 - BS magnus)