What is a Demogorgon from Stranger Things?

Eleven destroying the Demogorgon in Stranger Things Season 1 gets me every time

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demogorgon Demogorgon Ye elemental Genii , who have homes From man's high mind even to the central stone Of sullen lead ; from Heaven's star

demogorgon Demogorgon Speed 50 ft , swim 50 ft Languages all, telepathy 120 ft Legendary Resistance If Demogorgon fails a saving throw, he can choose to