Bruor Ironbane at Bouldercrag's Refuge wants you to kill 10 Nidavelir Stormforged. You may kill Stormforged Champions, Stormforged Magi, or Stormforged War Golems.
10x Nidavelir Stormforged slain
Like Bouldercrag, I once served the keepers as a craftsman in Ulduar, but with Loken's betrayal, I turned my hammer toward our new foes.
When we could spare the men, I led raids on Nidavelir to relieve the pressure on our defenders, but our lines are near collapse.
You've proven yourself a capable combatant and a staunch ally. Perhaps you'd be willing to take up our banner and take the fight to Nidavelir, the iron dwarf stronghold to the southwest, across the Snowdrift Plains.