Hope Lost

From PathfinderWiki

The Hope Lost mine in the Irrisen province of Wintercrux produces the rare blue quartz crystals known as ice diamonds that are notoriously arduous to excavate. Many forced to work here by the White Witches or Cold Sisters die quickly due to the mine's brutal conditions.1

The vicious Countess Grinnelise, whose palace is carved into the face of the mountain, oversees the mine. Enslaved miners prefer the daily beatings of the ice troll gang bosses over being summoned to the countess' palace, where the screams of victims during her notorious orgies of cannibalism and torture are unbearable.1

At some point recent to 4712 Ar, some slaves escaped using a secret tunnel and the help of yetis who dwell in a large warren deep in the mountains. The slaves gave stolen ice diamonds to the yetis in thanks.2