Diabolical Fullmoon Mysticism is the first album by Norwegian black metal band Immortal. It was released on 1 July 1992 through Osmose Productions. The only album to feature Armagedda on drums.

All lyrics written by Demonaz Doom Occulta; all music composed by Abbath Doom Occulta and Demonaz Doom Occulta.

The album was issued as a standard CD, a limited edition LP, a limited edition picture disc and a limited edition cassette tape. The picture disc was later reissued by Osmose Productions in 1998 and the regular LP was reissued in 2005.

John Serba of AllMusic said, "Diabolical Fullmoon Mysticism presents the germ of a soon-to-be-great black metal outfit", calling it "as rancid and unholy as other early Norse efforts, albeit a hair more melodic and listenable than some of its peers", though "one's time is much better spent with subsequent albums."

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Wikipedia