Just beat. Definitely one of the more difficult bosses I've fought in the game. She's easy until you get her health about 2/3 down, and then the fight becomes a bit of a clusterfuck.Ebrietas, Daughter of the Cosmos
I beat her quite comfortably in the end, though. Only used a couple of vials.
hands down one of the hardest bosses in the game because of how random she could be.