You get the quest for sword axe or Hammer smith in winterspring. For swordsmith it has you go to the undead side of strath wich you have to 5 man. You go through the entrance and go down the right side there will be plans for corruption laying on the ground...when you pick them up it summons the black gaurd smith wich you have to kill to complete the quest. We did it when i was level 55 with 60paly,58 rogue,55 paly (healing) 60 D speced warrior and a 60 hunter. with very little problems. I wouldnt recommend fighting the banshee boss though she is jut to the left. if you clear carefully you can get the plans to with out having to fight her.