On Athas, the planet of the "Dark Sun" campaign setting, dwarves stand less than 5' tall and weigh nearly 200 lbs. Each dwarf pursues a singular obsession, called a focus, that requires at least a week to complete. Athasian dwarves do not live underground, but some communities focus on unearthing long-lost dwarven strongholds. Physically, the dwarves of Athas are unique among their kind, having no hair at all. Athasian dwarves can breed with humans to produce muls, who are sterile offspring that share the strength and resiliency of dwarves with the size of humans.