Näkki
Näkki is the Finnish malevolent water spirit, loaned from Swedish näck. Appears as beautiful woman combing golden hair on rocks, or as old green-skinned monster. Lurks in rivers, lakes, fords, under bridges; drowns night swimmers. Children warned: 'näkki onto the land, me into the water' before swimming. In North Karelia, distinguished from vetehinen (näkki grabs, vetehinen infects).