Light Elves (Ljosalfar in Old Norse) are said to be brighter than the sun to look at, and they can be found dancing in the morning mist. They may look innocent, but dont' get too close, as you will then feel the urge to dance with them, and you won't be able to stop until you die from exhaustion.
The darker and trollish counterpart to Light Elves, Dark Elves are said to be pitch black in colour, and behave very much unlike Light Elves, and these elves live underground. These mythical creatures were never as popular as the Light Elves, and became mostly forgotten after the Viking Age. As such, not much is known about them, and there is speculation as to wether dark elf was simply another word for dwarf, or if they were the opposite of light elves. In this game, they are the opposite of light elves.