What is The name of the monster in night on bald mountain?

Night on Bald Mountain is a piece of music. The Disney portrayal of the piece in the full length Disney motion picture, Fantasia, depicts a portion of the music envisioning a frightening and apparently evil spiritual being arising from the mountain. That being is unnamed, but very much resembles most people's vision of the Devil.

While it doesn't actually appear in the movie, the name commonly associated with the large demon in the Night on Bald Mountain segment is "Chernobog" (or "Chernabog," sources vary on the spelling). The name, which means "black god" in Russian, comes from the name of a god in Slavic mythology.