Irish folklore has lots. Banshees are pretty famous. It’s a ghostly wailing you hear at night. When you hear it someone dies.

One of the nicer stories is children cursed to be swans instead of people due to an evil stepmother. They end up outliving everyone and moving to the land of youth, as swans.

Fairies are evil.

Butterflies are a link to the other world.

Hell is cold, as a hot hell, like Christian hell, was considered to provide a small amount of comfort.