Bosses

Gatekeeper Vorthak

Abilities: 

Running spree

Running Spree is the main mecanic of the boss. 

Vorthak is at the top of the room and divides it in 4 equal parts, that appears for a few moment before exploding, dealing 80% damages of your total health. 

On those 4 parts, 1 doesn't have the mecanic. You should go to that section of the room to avoid taking damage from Running Spree.