Duergamiir is a titan that wander the Lonely Expanse, creating all the worlds. He came upon a lifeless rock and used his forge, Solos, to turn it into Terrenia. He then created the Dwarves out of rocks to finish his work creating the world. Duergamiir left to create more worlds, but many believe he will return one day. There is no agreement on what it means when he does.
When you die, your body returns to the ground to become a new dwarf (if you are a dwarf, otherwise you’re just dead).