Here's my list with a self-imposed limit of one album per band (too difficult otherwise). After eliminating a lot of albums from a larger list, I realised that 25 was the minimum and not the maximum, so I decided to stick to 25 in the end. Also, I'm not including grunge or stoner rock.
1. Windir - Arntor
2. Arcturus - La Masquerade Infernale
3. Isis - Oceanic
4. Death - The Sound of Perseverance
5. Opeth - Morningrise
6. Mekong Delta - Dances of Death (And Other Walking Shadows)
7. Meshuggah - Destroy Erase Improve
8. Neurosis - Through Silver in Blood
9. Atheist - Unquestionable Presence
10. Gorguts - Obscura
11. Ulver - Nattens Madrigal
12. The Lord Weird Slough Feg - Twilight of the Idols
13. Amon Amarth - Once Sent From the Golden Hall
14. Summoning - Minas Morgul
15. Demilich - Nespithe
16. Bathory - Hammerheart
17. Cryptopsy - None So Vile
18. Autopsy - Mental Funeral
19. Esoteric - The Pernicious Enigma
20. Iced Earth - Burnt Offerings
21. Agalloch - Pale Folklore
22. Artillery - By Inheritance
23. Falkenbach - Magni Blandinn Ok Megintri
24. Katatonia - Dance of December Souls
25. Devin Townsend - Infinity
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