i'm not a big fan of all of their material, but First Spell, Seen Through the Veils of Darkness, and Malice are awesome. Adimiron Black is pretty good, it was when they went pretty much straight death metal. the following albums aren't very good at all.
the song "Angel Wings and Raven Claws" off of First Spell is the very first black metal song i ever heard, and what sparked my interest in it. i think that was 96.