Greyspine Quarry

Greyspine Quarry is a dwarven mithril mine located in Kraghammer. In Season 1 of Critical Role, the mines are the central location where K'Varn sends his minions through in order to test the defenses of Kraghammer.

Mine Description
The mine itself is made up of three deep holes that stretch far into the side of the mountain going down. As the mine is dug out, Kraghammer slowly begins to build up in areas that are no longer in use, thus allowing the city to expand downwards. Many mining buildings stretch around the center of the quarry. There are also a series of tunnels that go off to the sides of these main tunnels.

Background
Prior to Lady Kima and Vox Machina's arrival, the mine had been fairly prosperous, though labor intensive as the owner of the mine, Nostoc Greyspine, tends to work his employees to the bone. However, at some point large waves of goblins trolls, and other creatures began to flood out of the mines. At first this didn't seem unusual, it was not until later that many realized these creatures were running from something.

Eventually undead monstrosities began to emerge from the tunnels. These creatures had so much power that eventually many dwarves were forced back into the mines to collapse entire sections in order to contain the onslaught. During this time many workers were caught either by these monstrosities or by Duergar and taken into the Underdark.

Both Lady Kima and Vox Mochina would later use these same tunnel systems to delve into the Underdark in order to uncover what was happening.