When Väinämöinen killed the giant Northern pike, he made a kantele (Finish instrument) out of its jaw bone. For some reason, it`s full of magical power. Anyone who uses it, can do magical things (it requires knowledge of playing a kantele, and skill to play an instrument, to do so succesfully, though). Sing persons in to a swamp, get to another place etc.
It`s been used by only a few persons, in comics. Väinämöinen, Donald duck and Louhi.