During dps right before vosik does his AOE 2 charges drop down (that people usually throw at him for extra damage) Split into 2 groups of 3. Each group takes 1 charge And goes left/right and uses the charge on the panel that shuts the room So basically 2 rooms need to be activated every time you dps And you have to kill vosik on the 3rd time (Make sure both groups are in separate rooms) (Crouch when you throw the charge. It helps)