The Elidhu are a fictional race of beings which exist in the world of Pellinor created by Alison Croggon.
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These are Arkan, the personnification of ice, who is often seen as evil (although Maerad is given reason to think otherwise in The Riddle); and Ardina, Maerad's ancestor, who is seen as good.
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She also appears in The Riddle as a lunar faerie or demigoddess, called the Moonchild, in which form she is said to be the daughter of the moon.