Mandator, Formerly known as Mysto Dysto, formed in 1983. As Mysto Dysto, they made 2 demos, and a studio album "The Rules Have Been Disturbed" released in 1986. They changed their name to Mandator in 1987. As Mandator, they released 1 demo, 2 studio albums, "Initial Velocity" and "Perfect Progeny" they also released 1 single. The band is now split up.

Source: https://www.facebook.com/Mystodator/info/?tab=page_info