It's always been possible. Loads of people have done it.
bruh how. I just cheated like crazy with the save editor and even then I can't even hit her.
Edit: After mucking about in the save editor for a while I found a way to pretty consistently beat her but its defintely not worth the effort
equipment- Chrysanthemum petal, champion belt, (anything that increases attack power is good, defense is irrelevant)
Class- I used white mage for righteous fury but thief could be better.
Stats-Max strength/agility/cunning
Boon- Razorcup nectar
Powers-Charge weapon, Sure shot, Assassiniate.
Inventory- 20 kailera tears( you can get them from kohaku)
Strategy(if you can even call it that) Sureshot->assassinate->sureshot->charge weapon->Repeat
The two main issues with the kass fight are that she will almost assuredly kill you before you act and she has 145 avoid so most things cannot graze her.
Sureshot and assassinate cannot miss and kassyra does not have crit immunity. So using this you can at least do damage to her. She has three actions per turn and is likely to kill your party(and you) before you even get an action. she also has extremely high initiative so she will likely act three times in a row. I haven't tested a max durability build so maybe that could work, I wouldn't know.
Its kinda rough since winter city gates quite a few things so you can't even have an endgame build ready. I didn't know what to put for the second recharge and encounter power. I only used charge weapon since that was one of the few things that would always hit her for me and she has -100 holy resist. Stacking all the damage buffs from party members is basically the only contribution they will have, none of them can really contribute past that since they are going to die round 1. You can technically tears one of them if you wanted them to ult but i don't think any of them are good enough to warrant it. quint mind snap could be nice but he can't hit her.
Stance powers are kinda dog since you lose them on revival but she has 145 evasion. so even with 67 base accuracy and smite evil's +50 accuracy I still could not hit her. There is definitely a more efficient way to do this fight but I'm not that fluent in this games mechanics. A tank build might be better but idk if you could survive a lunge. Nullfying crits against with a shield and the cloak that stops sunder would probably be very effective if you did try to tank but since she has three action points she will be able to lunge every single round so youd have to survive a full damage lunge, double attack and driving thrust.
If any of you have beaten her in the current patch lmk what worked for you. After searching through the forums it seems like it was possible in past versions but kas apparently has been buffed to make beating her more difficult and those strategys no longer work .
