Their characteristics are well-known. They're beautiful -- when they're not astoundingly ugly. They're both goddesses for men to worship, and demons for them to flee. They adore children, sometimes to the point of unhealthy obsession. They have a strong association with nature, from which they're often assumed to draw magical power. Their anger is a terrible thing to behold, and all the more fearsome because anything can spark it; the rules by which these creatures operate are not those of rational men. They are creatures of fanciful whim, and they never, ever, can be understood.