Depending if they're 60 or 75 attack, it will vary. Back when I had my pure and I played, 60 attack zerks would combo me out so hard with their dragon dagger. 75 attack zerks would be easier since their ags combo wouldn't hit so high because their strength was a bit lower. Either way, if your 1 def pure is 99 strength with an ags, and you combo it right, it won't matter if they're a zerk or not.