WTF even happened here? Just me vs. a lone rare bulwark, normally on Insane this is a 'bump a couple times until it's gone' situation. But instead it one-shot me for 2803 damage, ending my run?

I saw it activated its helm, must have been one powerful-ass helm! Just a perfect storm of abilities, a critical strike, and counterstrike?

Character: https://te4.org/characters/315363/tome/28b9b9a7-0db5-4405-af73-a4cee994b2bc

Just found myself in the exact same Position as my previous Post, except I am now Cursed.

I did not go with Zigur this time and I also cleared out all Dungeons that I thougth I could.

I have not yet found the Rune of Dissipation.

I just really dont want to mess this one up.

Edit: Im a Dumbass. Didnt kill Urkis yet, so I obvoiusly couldnt find the Rune of Dissipation yet. Gonna do that now.

Edit 2: Somehow got him in Melee-range.

Edit 3: After another Death, I somehow managed to pump out enough Damage to finally beat him! Thanks everyone for the great Advice!