There are 5 races in the game: Human, Dwarf, Lich, Rakan, and Sylph. The Sylph race is not currently available to players. To Switch races, enter your stronghold (Castle for Humans, Engine for Dwarves, Pyramid for Lich, Palace for Rakans), then expand the buildings menu at the bottom of the screen. On the far right you will see the "Change Race" option. It costs Honor to change race.