Mount Renata

Mount Renata was the old capital of the Great Northern Dwarf Empire in The Age of the First Star. At some point during Ere'tsaa's invasion, Mount Renata was sealed off magically and all the inhabitants perished. Ever since, Mount Renata looks indistinguishable from a regular mountain, with no obvious entrances.

The Prophecy
It is claimed by Dwarven scholars that Thom Orrhein sacrificed himself and the inhabitants of the capital to stop Ere'tsaa looting the riches to fund his war effort. It is assumed that Thom Orrhein designed a way to reverse the magic which can only be found by a Dwarf.