Hiisi

Hiisis (root: hiisi, plural hiidet) are a kind of tutelary spirits in mythologies of the Baltic Sea area, especially in Finland. In Christian tradition, they are most often considered to be malicious or at least very horrifying. They are found near salient promontories, ominous crevasses, large boulders, potholes, woods, hills, and other awesome geographical features or rough terrain. Originally, the term meant "holy place". In the related Estonian language 'Hiis' still means sacred forest.