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Michael Gregor (also known as Silenius) is an Austrian musician who is currently in the bands Amestigon (since 1998) as vocalist, Kreuzweg Ost as programmer, and Summoning as vocalist, keyboardist, and bassist; the two latter bands are bands that he is a founding member of. He supplied vocals for Abigor from 1994 to 1999 and appeared on seven of Abigor's releases. Silenuis was vocalist and keyboardist for Pazuzu and played on the band's split album and debut album. Along with fellow Summoning bandmate Richard Lederer, Silenius also used to be a member of Die Verbannten Kinder Evas, serving as a vocalist and a keyboardist. Silenius has recorded music for a project called "Mirkwood", which, as of yet, has no material released.