Corrupted - Paso Inferior (1997)

And if you're looking for more extreme doom/stoner a la Boris or Sunn O))) then I recommend this ugly, filthy piece of drone metal. The first half is filled with the most evil, sludgey atmosphere you can imagine as well as some hateful growls to go along with it. Were there melodies, this would certainly qualify as funeral doom. The second half, on the other hand, is an eerie dark ambient piece with chilling wind samples, ethereal vocals, and slow, brooding synths. It's certainly one of the finest examples of drone I've heard, and is yet another excellent achievement by the oft-ignored Japanese metal scene.
9/10