There are five distinct humanoid races dwelling upon Arellea: Elves, Aeriens, Selkens, Eldran, and Nerisiens. While each has their own unique physiology including varied lifespans, they are able to bear mixed-blood children who are capable of reproducing, and thus are considered of one species. All share their humanoid shape, brain structure, and reproductive capabilities, whatever additional traits they may have. These five races, as well as mixed-blood humans, are described in further detail within the pages that follow.