Fell Seal Arbiter's Mark SEPTIMUS AGAIN? Cataracta Citadel fight (very hard)
One of the worst maps in the game imo, I was just getting bored of all the demons then this showed up, out of all the enemies on this map only one of them can't swim, and he probably won't go anywhere near water, so the sole reason those patches of water exist is for Septimus to teleport your character into it, it ignores evade magic, ignores protect, pretty annoying alright.
Map is small af and no real places to hide, just have to brute force it like this, I didn't enjoy this fight at all, a thing to note is that Secunda is not immune to root, so if someone has a dedicated crit character, like a dual wield gun user that happen to have 100% crit at this point of the game then he can keep Secunda permanently rooted with nail gun, and she can't do anything if your team has evade magic, I don't have a character like that with me so it might be something worth trying another time, actually Katja can probably root her with nets, although that'll put her in locus range so evade magic or mirage will be required.