Electric Wizard - Dopethrone (2000)

Not quite as heavy or inaccessible as Moss but certainly one of the heaviest albums of all time, Dopethrone is an assault on the senses and offers some skull-shatteringly heavy riffs. Add to that the spooky occult atmosphere and the Ozzy-esque vocals and you get one of the best stoner/doom albums of all time.
9/10