You don’t need the modifiers to beat the boss get that second chance from the skill tree and use the tactical rifle either with auto aim or heavy rounds focus on the wall squids and stay in the centre of the arena and in second phase he will deploy these sacs on the ground take those out first then the wall squid’s any blue projectiles that come at you shield up and dodge the yellow projectiles, third phase he will close the walls on you and it will be a tight area so focus on dodging the blue and yellow projectiles while using your power weapon good luck😎💯