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Shadowking is believe to have been recorded shortly after recording of Infidel Art as a way to experiment with MIDI technology in preparation for Hail Horror Hail. The song was not placed on Infidel Art because the entire album was done on synthesizer, not MIDI.
The intention at the time was to release an EP entitled Shadowking where Sigh's two studio covers of Venom's "Black Metal" and "The Seven Gates of Hell" would be featured alongside this version of "Shadowking." Plans were even made to include a booklet which explains topics of Japanese occultism in English, but this plan never materialized and "Shadowking" remains to be found only on the Roots II compilation and The Crypt's 2010 vinyl reissue of Infidel Art.