Reilagg

Literal Translation: the Lair of Vermin

This is the domain of the god Durathor, antithesis of the Erigrim. It is a place to be feared and fought against. It is not seen as a place of punishment (such as many humans believe) where un-virtuous Dwarves are sent after death. It is the core that drives the war on Heldar, the corruption of the deep caverns. The Reilagg is said to be existing both in the realm of the gods and on the Azthin. When You dig deep enough you might open a cavern into this forsaken realm.

Gateways

The deeper one descends into the core of the world, the further one steps from the normal laws of physics. Parts of the Myst Aether seeps through in tenrils and Ripples become manifest. Delving deeper still, holes into the Reilagg starts to appear and the devils that inhabit it can freely pass. In this deep, mysterious place is where the eternal battles of the dead Dver rages on.

For folk travelling from the Material Plane, they often mistake the Reilagg for Tartarus as they look similar and have similar gateways in the deep underground.