Often used to describe bands like Pantera and Exhorder. With mid-tempo riffs similar to those found in Thrash Metal and a tendency to focus more on groovy syncopation and heaviness than outright speed.
They consciously changed their sound up for My Arms, Your Hearse. Still Life was a more refined iteration of those ideas, and probably an easier pill to swallow since they'd already laid the foundation for it. As a big fan of the first two albums it took me a while to get my head around their "new direction" back in the day. I'm curious what makes you lump them in with black metal - some combination of melodies, atmosphere, vocal style, and overall sound?