Sampo
The Sampo is not a monster but a magical artifact — a wondrous mill forged by Ilmarinen that produces salt, flour, and gold, central to the Kalevala's plot. Stolen by Louhi, fought over, and shattered in the sea, its fragments bring prosperity to Finland. Classifying it as a 'monster' and 'forest-spirit' is a category error; it is a cosmological object in Kalevala mythology.