Gaaaah, I remember these guys. Good band, some cool guitar playing too. Always loved how "Lake of Fire" started out with that UFO stuff - cheezy but so goddamned headbangable. "Before Christ / After Death" was probably the best song though.
I remember Crypt of Kerberos doing something similar a few years later, though without the keyboards and a bit less thrashy. That was just their full-length though, the previous stuff was heavier I think.