"or Exhorder... exhorder is just normal groove band" - Actually, Exhorder have a lot in common with Demo Hammer. They're not "just normal groove". They're straight-up thrash with a few slower riffs here and there, at least on their first album. (Haven't heard The Law).
@Metalmilitiant Yeah and you right those first two albums sounds like Death Metal being born. I still don't see why Chuck gets to be called the father of death metal when their were bands far more brutal than them before the genre came into term Possessed "Seven Churches" had more energy brutality and it sound more scarier than scream bloody gore. But Kreator's "Endless Pain" and "Pleasure to kill" were in my opinion the mosst brutal albums to come in the eighties