Umbral Ore

Umbral Ore is a strange ore found by one of the students of a blacksmith named Sturgy Ironband in Dun Morogh. Unfortunately the Dark Iron Dwarves seem to have a deadly interest in this ore as well.

Source
Umbral Ore can be found in a strongbox in Ironband's Compound south of Helm's Bed Lake in Dun Morogh.