I made this list real quick and came up with just a few more than 25, so I'll leave it as is, in no particular order...and keep in mind I've only been into Metal for 5 years or so, so most everything is this decade...(and I only allowed myself 1 album per band)...
Opeth - My Arms Your Hearse
Nevermore - Dead Heart In A Dead World
While Heaven Wept - Vast Oceans Lachrymose
The Prophecy - Into the Light
Nokturnal Mortum - The Voice of Steel
Katatonia - Viva Emptiness
The Chasm - The Spell of Retribution
Novembre - The Blue
Anathema - Judgement
Insomnium - Above the Weeping World
Dark Tranquillity - Damage Done
Edge of Sanity - Crimson
Primordial - To the Nameless Dead
Drudkh - Autumn Aurora
Isole - Bliss of Solitude
Emperor - In the Nightside Eclipse
My Dying Bride - Songs of Darkness, Words of Light
Withered - Folie Circulaire
Death - Symbolic
Year of No Light - Nord
Belenos - Errances Oniriques
Windir - Likferd
Swallow the Sun - Hope
Immortal - At The Heart of Winter
Enslaved - Mardraum
Vehemence - Helping the World to See
The Crown - Possessed 13
Pig Destroyer - Terrifyer
I have been into metal since the early 80's. Here's my 25 favorite albums!!!!
Venom-Black Metal
Paradise Lost-Shades Of God
Slayer-Reign In Blood
Exciter-Heavy Metal Maniac
Mercyful Fate-Melissa
Jag Panzer-Ample Destruction
Manowar-Hail To England
Iron Maiden-Piece Of Mind
Lost Horizon-Awakening The World
God Dethroned-Lair Of The White Worm
Candlemass-Death Magic Doom
Black Sabbath-The Mob Rules
Death-Symbolic
Exodus-Bonded By Blood
Metallica-Ride The Lightning
Iced Earth-Something Wicked This Way Comes
Trouble-Psalm 9
My Dying Bride-Turn Loose The Swans
Overkill-Feel The Fire
Kreator-Endorama
Marduk-World Funeral
Judas Priest-Screaming For Vengeance
Anthrax-Sound Of White Noise
Accept-R
I have been into metal since the early 80's. Here's my 25 favorite albums!!!!
Venom-Black Metal
Paradise Lost-Shades Of God
Slayer-Reign In Blood
Exciter-Heavy Metal Maniac
Mercyful Fate-Melissa
Jag Panzer-Ample Destruction
Manowar-Hail To England
Iron Maiden-Piece Of Mind
Lost Horizon-Awakening The World
God Dethroned-Lair Of The White Worm
Candlemass-Death Magic Doom
Black Sabbath-The Mob Rules
Death-Symbolic
Exodus-Bonded By Blood
Metallica-Ride The Lightning
Iced Earth-Something Wicked This Way Comes
Trouble-Psalm 9
My Dying Bride-Turn Loose The Swans
Overkill-Feel The Fire
Kreator-Endorama
Marduk-World Funeral
Judas Priest-Screaming For Vengeance
Anthrax-Sound Of White Noise
Accept-Restless And Wild
Sodom-M-16
(1 entry per band)