Tips needed on Gate Controller
Run in with mace or staff, drop a symbol, switch to GS and drop another symbol, auto-attack it. Guardian is actually better and faster than thief since you can’t backstab the controller and you don’t die nearly as easily.
If for any reason you’re really having problems with the hellstorm killing you, bring Shelter and block his flamethrower burst for a free 25 stacks of might. Should make the controller go down a lot faster.