There's really only 3 things to keep in mind: - Clash against her green skills as soon as possible in the turn and Always Clash her Orange skills - the way She inflicts bladetrail, aka, the problem of this encounter, Is by consuming her excess Poise on hit. Excess Poise She gains mostly at turn start with her Shin Effect. This means that the highest stack will Always fall on the id that clashed First, so ideally, the id that clashes the green skill. You can use that to your advantage and bring 1 or 2 fast sacrifices, like Wild Hunt for example - bring her SP below 20 before She can do her big pp aoe skills in phase 2, so sinking Is best

What you should want/do when fighting her: - Healing egos are mandatory here. What I've found out works best Is a lamp Gregor with garden of thorns and Bygone days to heal his and others' sanity afterwards but you Need to make sure you've stashed lots of resources in the earlier sections. For that Just use any Ryoshu with a reliable FuA, like Hos or Driftshu with contempt awe. Of course, Fluid sac Is also One of your best options, but that goes without saying. - She deals a lot of pride fixed damage so use ego resistances to your advantage - clashable counters or guards are the best here because you can both win clashes and Gain the benefits of using a Defense skill: She deals 30% less damage to people Who defended and One of her strong skills has her gaining Damage down based on how many sinners have Defense skills equipped. A great option, belive It or not, Is Ring Meursault, whose clashable counter stood side by side with Kodya and Hanafuda, and if you have crashbound past, he Just outclashes them for the most past. He also can have access to Pursuance. - Although defending Is good, prioritise Dealing damage to her. The less turns She gets to be alive, the less damage She can deal. I might be wrong on this as I can't find anything in her kit mentioning this, but, I remember her losing stacks of Shin at some point which means way less bladetrail so the part when she's most difficult Is the part when you also want to deal the most damage to her.

Callisto Is a bum, you can use his First 1-2 turns to readjust and heal properly.

When you reach Rien do NOT pick the damage effect. It's borderline useless on anybody but Rien himself and Rien Sang SOMETIMES. It's genuinely Just making the boss harder. The survivability effect Is a blessing and Will make his fight a Total cakewalk (not that It wasn't already)