Stop crying, I killed 2 stormcallers with arc blade in the iron banner just yesterday one after the other, it's not hard and they aren't OP, also it's a super they aren't supposed to be easy to kill, get your distance and take them down with your team, you and 1 or 2 other people shooting one together melts them in seconds, you can even shotgun one to death if they aren't aware but that's risky