Did you mean: Shagrath Antichrist
Antikrist is the only opera by Danish composer Rued Langgaard. It was composed in 1921–23 and reworked in 1926–30, but despite several attempts by the composer to have it performed, the work was not premiered until many years after Langgaard's... Wikipedia
Librettist: Rued Langgaard
Composers: Rued Langgaard, Shagrath, and Silenoz