Demilich
Remember
Thorns definitely deserves to be on the list - but not for Thorns, which suffers from most of the same defects of imagination that plagued other 'avant-garde' black metal efforts of the 1997-2002 era (Ved Buens Ende, Dødheimsgard, Fleurety etc.). The demo work, however, was brilliant, original and enormously influential on the subsequent development of black metal.
Would you mind expanding a little on the defects of imagination evident on an album such as "Min Tid Skall Komme"? I can't remember much about it, only heard it once or twice, but I do recall enjoying it and finding it to avoid at least some of the trappings of the faux-avantgarde.