De·mo·gor·gon /ˌdiməˈgɔrgən, ˈdiməˌ/
  魔王;魔神
  De·mo·gor·gon n.  A mysterious, terrible, and evil divinity, regarded by some as the author of creation, by others as a great magician who was supposed to command the spirits of the lower world. See Gorgon.
  Orcus and Ades, and the dreaded name
  Of Demogorgon.   --Milton.
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  Demogorgon
       n : (Greek mythology) a mysterious and terrifying deity of the
           underworld