Vodka vs Mimiron Hardmode. The hardmode of this fight involves pushing the self-destruct button in the back of the room. This increases Mimiron's hp and the damage of all of his abilities. It also adds new abilities including doomfires. The whole fight must be completed in 10 minutes and he is widely considered to be the most difficult boss in the instance.
PoV: Killars (Rogue)