About Betrayer: There are at least five artists that use this name 1. A thrash metal band from Norway 2. a power metal band from Canada 3. A death metal band from Poland 4. A blackened thrash metal band from Indonesia 5. A deathcore band from the United States 1) A norwegian thrash metal group formed in 1989. They published their only (ep) album "World of Chaos", in 1993. The band broke up 'cause geographical distance between the members was too high.