Shimmergloom

Shimmergloom was a shadow dragon who arose from the depths of the Underdark after the Battlehammer dwarves of Mithril Hall delved too deep in their mithril mines. Shimmergloom drove the dwarves from their ancestral home, forcing them to resettle in the Icewind Dale region, and supplanted them with his Dueger (Grey Dwarf) servants. Shimmergloom reigned over the hall for roughly one dwarven generation until Breunor Battlehammer, the rightful heir to the throne of Mithril Hall returned to the hall in his adulthood in order to reclaim it. Shimmergloom attempted to retain his hold on the hall through the efforts of his servants, most notably, two shadow mastiffs, although he eventually had to confront the intruders himself, where he was eventually slain by Breunor after the dwarf strapped a barrel of flaming oil to his back and jumped on to the shadow dragon's back. The ensuing inferno destroyed Shimmergloom, although Bruenor was unwittingly saved by carrying the scimitar Freezing Death with him into battle, with the blades magical protection from fire allowing the dwarf to ride Shimmerglooms burning corpse safely to the floor of the hall.