Long before extreme metal exploded into countless subgenres “Don’t Break the Oath” showed the world just how dark, dramatic and dangerous heavy metal could become.
Released in 1984, the album saw Mercyful Fate sharpening every edge of their sound. From eerie melodies to razor sharp twin guitar attacks by Hank Shermann and Michael Denner, the record delivered a chilling atmosphere that felt almost cinematic. At the center of it all was King Diamond whose haunting falsetto became one of the most recognizable voices in metal history.
Tracks like “A Dangerous Meeting”, “Desecration of Souls” and “Come to the Sabbath” didn’t just sound heavy, they sounded forbidden. The album mixed classic heavy metal power with darker, more progressive ideas that would later inspire thrash, black and extreme metal bands for decades to come.
Many fans still see it as an even stronger and more focused release than “Melissa” helping cement Mercyful Fate as true pioneers of occult metal.
More than 40 years later “Don’t Break the Oath” still feels sinister, theatrical and completely untouchable, the kind of album that changed metal forever.

Mercyful Fate
King Diamond – vocals, keyboards, harpsichord
Hank Shermann – guitars
Michael Denner – guitars
Timi Hansen – bass
Kim Ruzz – drums
Benny Petersen – guitar (track 10)





















