Istivin : City of Shadows.
The Crystalmist Mountains are the highest of the mountain ranges in the Flanaess. They divide the Flanaess from the Baklunish West. The Hellfurnaces are the heavily volcanic southern portion of the same range.
Natives of the Crystalmist Mountains include frost, hill, and mountain giants, goblins, ogres, orcs, trolls, bugbears, white dragons, mountain lions, woolly mammoths, woolly rhinoceroses, and giant wolverines. Mountain dwarves mine these mountains for precious metals and gems, trading them with humans on both sides of the range.
There are also groups of proto-human Neanderthals scattered throughout the Crystalmists.