Obscura gets 20th place.
After Avigrus:
1. Atheist - Unquestionable Presence: 21
2. Candlemass - Epicus Doomicus Metallicus: 21
3. Coroner - No More Color: 24
4. Deathspell Omega - Fas, Ite, Maledicti, in Ignem Aeternum: 18
5. Demigod - Slumber of Sullen Eyes: 20
6. Demilich - Nespithe: 7
7. Deströyer 666 - Phoenix Rising: 28
8. Dissection - The Somberlain: 33
9. Emperor - Anthems to the Welkin at Dusk: 4
10. Fates Warning - The Spectre Within: 26
11. Mayhem - De Mysteriis Dom Sathanas: 30
12. Mercyful Fate - Don't Break the Oath: 19
13. Metallica - Master of Puppets: 36
14. Motorhead - Overkill: 2
15. Negură Bunget - OM: 18
16. Neurosis - Through Silver in Blood: 15
17. Opeth - Morningrise: 20
18. Pestilence - Consuming Impulse: 11
19. Sepultura - Beneath the Remains: 23
20. Slayer - Reign in Blood: 35
Silver/ Fas/ Phoenix
My personal favorite is Sabbath Bloody Sabbath- it was the original fusion of prog and heavy metal. However, I'll give my vote to Master's, since its obviously one of the most influential metal albums ever. Sweet Leaf, Children of the Grave, Lord of This World and Children of the Grave are all amazing. However, I really can't stand the preachy After Forever (and more generally, the nauseating Christian lyrics).