Utumno (Dimension)

Utumno, also known as Udûn, was the first fortress of Melkor (later known as Morgoth), built many tens of thousands of years before the Third Age. It was delved deep within the earth in the far north of the world, being comprised of many dungeons, tunnels, and halls of ice, obsidian, and fire. In Utumno Melkor bred many evil and secret things, such as the first of the Orcs, Wargs, Trolls, and Spiders.

The Valar laid waste to Utumno after a great battle whereafter Melkor was chained and brought to Valinor. Yet the ruins of Utumno endured, and it is whispered that somewhere deep within the wastes of the Forodwaith lies a forgotten entrance to the Pits of the Underworld...