Hadean Cluster (Endhaven Supplement)
From D&D Wiki
The Hadean cluster is named after the great Hadean mountain range. In Dwarven Legend, Hadør was the first of the great Elemental Lords of Earth. When he died, his body became the Hadean Mountains, and his phallus became holy Mount Kreta. These mountains teem with the powers of earth.
The mountains stretch wide and far. The Great Dwarven Union and the Twelve Kingdoms dominate the southern part of the mountains. The vast bulk of this range is dominated by tribes, small powers, strange peoples, ruins, dragons, and vast wildernesses. Very few have ventured deep into these mountains. The dangers are considerable.