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.
1x North Lightning Forge damaged
1x Central Lightning Forge damaged
1x South Lightning Forge damaged
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, [player], 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.