Destroy the North Lightning Forge, the Central Lightning Forge, and the South Lightning Forge with
Bouldercrag's Bombs, then return to Bouldercrag the Rockshaper at Bouldercrag's Refuge.
[Bouldercrag's Bomb ]
In my folly, I'd thought
Valduran's project at Narvir's Cradle, a large construction area to the south, no more than a grotesque monument to "Keeper" Loken's cruelty.
Now we know the truth, that it was meant to be used as a weapon against us and our allies. We must not allow this iron colossus to reach completion, <name>, for it will mean the end of the refuge.
Go to Narvir's Cradle, find the lightning forges the stormforged artisans use, and sabotage them.
Were you able to hamper them by sabotaging the forges?
Excellent work! Oh, it won't stop the iron dwarves, but it'll take them valuable time to rebuild those forges. I daresay we've gained the advantage.
The three forges are all on the ground level in a line about 100 yards apart. They're more west to east than north to south, though.
or  The Earthen of Ulduar  The Exiles of Ulduar
 Rare Earth
&  Relief for the Fallen  Fighting Back
&  Slaves of the Stormforged  The Dark Ore
&  The Gifts of Loken  Facing the Storm While killing golems, loot the to continue the quest chain. [Dark Armor Plate ]
 Armor of Darkness
 The Armor's Secrets
 Valduran the Stormborn
&  Destroy the Forges!  Hit Them Where it Hurts
 A Colossal Threat
 The Heart of the Storm  The Iron Colossus