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Ellipsis of holy unblack metal.
unblack metal (uncountable)
- (music) A genre of black metal marked by Christian lyrics.
2015, Marcus Moberg, Christian Metal: History, Ideology, Scene, Bloomsbury Publishing, →ISBN, page 51:As already noted, the black metal-related church arsons in Norway in the early 1990s also spurred the development of unblack metal.
