Oslo Death / Thrash Metal project. NUCTEMERON's vocalist Eternity, also a member of BARK, OPTOLETUM and IN SILENCE, alongside a pre-MAYHEM Blasphemer, also issued solo Black Metal demos under the billing ETERNITY with 'In Subspecies Aeterna' published in February 2003 and 'To Become The Great Beast' arriving during September 2005. Punisher, handling guitar and bass, holds affiliations with OLD MAN'S CHILD and OPTOLETUM. Early recordings included Tex Terror of NOCTURNAL BREED on drums.

NUCTEMERON would record the demos 'Angel Of Destruction' in 1997, 'Buried In Flesh' in 2004 and 'Serpent' during February 2005.