Deepdwellers and wanderers of magma, the Firewalkers of this age were brought into the surface of the world by foolhardy and greedy miners, who tried to dig tunnels for magma to flow into furnaces and smithies. Instead, they enters the hall of Magma Brutes who greeted their visitors by burning them and sent their bones and ashes floating back up in caskets made of obsidian.
Relations with the surface people have since improved and the Firewalkers have found they have more in common with the Commonwealth than anyone else, opening deep caverns to connect the underworld with the surface.