Golden Skull Campaign
The Dwarves have become a bastardized version of their former glory. Where once they ruled mountains and thrived economically, they struggle now to even procreate. And the Don Dwarves, weak and petty shadows of the fabled Dwarven Kings of legend.
Over 400 years ago, the Dwarves dug too deep and unleashed the Demons of the Undermountain. The Dwarves were strong, had numbers and equipment, but none of it could contend with the overwhelming power of the Demons. They had no choice but to flee the very mountains their race was born in. Ever since, the Dwarves have struggled to live off the land or from what shallow caves they attempt to mine from, and they refuse practically all forms of aid due to their stubbornness.
Whether by the rumored curse bestowed on them by the Demons or simply just malnutrition, Dwarves have become increasingly infertile with each successive generation.