Dark Elves are descendants of Elves that during the 2nd Umbral Age attempted to use a Divine magic called Exit Mundi which ended in their bloodlines being cursed by The Gods with the inability to use magic.
Fairies are the smallest and frailest of all the races.
Beastkin is a blanket term for any Lesser Race that exhibits animal-like appearances. Most of these races consider the term Beastkin an insult.
Orcs are theorized to be a subrace of Giants due to their many similarities, this is heavily denied by Giants.