seelie

Two of the most prominent categories of fairies, derived from Scottish folklore, are the division into the Seelie Court and the Unseelie Court. The Seelie (Blessed or Holy) Court was seen as more beneficent toward humans. They were known to seek help from humans, to warn those who had accidentally offended them, and to return human kindness with favors of their own. Still, a fairy belonging to this court would avenge insults and could be prone to mischief. The most common time of day to see them was twilight.
_Wikipedia