The Underworldis a name for the sunless land of tunnels and caverns that exists between the verdant land of Thylea. More commonly referred to as “The Bowels of Thylea”, it is said to have formed from the twisting and turning guts of the mother titan when she formed the lands. It is said that the tunnels of the Bowels link all the lands of Thylea, including the islands - but they have never been mapped out, even by the Titans. They are a dangerous place, with rumours of mushroom men and blind monsters. The Dragonlord Dourin Kobalos, after the death of his dragon in the War, ventured deep into the Mithral Mines in an attempt to find a way of traversing the land without being seen by Sydon, Lord of the Sea. However, he never returned.