Dwarves

Dwarves are creatures living near the mountains, or even in the mountains. They are a subgroup of the Humans, separated themselves around 9400 Be.L. Dwarves are the discoverer of magical crystals called Mana. Due to Mana Eating, they shrank a bit in size.
During the War Era, Dwarves got enslaved by the Orcs, who imposed their culture and language onto them.