Oberst

Toil

8

Obituary

Cause Of Death	6
Dying Of Everything	6
Slowly We Rot	5
The End Complete	5
Xecutioner's Return	5

Obliteration

Cenotaph Obscure

7

Obliveon

Cybervoid	7
Nemesis	7
From This Day Forward	7

Obscene

The Inhabitable Dark	6
From Dead Horizon​.​.​.​To Dead Horizon	6
Agony & Wounds	6

Obscenity

The 3rd Chapter	6
Summoning The Circle	6
Suffocated Truth	5

Obscura

Akróasis	9
Diluvium	8
Cosmogenesis	7
Omnivium	7
A Valediction	7

Obscure Sphinx

Void Mother

7

Obscurial

Heretic

7

Obscuring Veil

Fleshvoid To Naught

8

Obsecration

Onwards The Mystic Paths Of The Dead

7

Obsequiae

The Palms Of Sorrowed Kings

7

Obsession

Scarred For Life	7
Methods Of Madness	6
Carnival Of Lies	6

Obsidian Sea

Strangers

7

Obsidian Shrine

Bloodshed Under The Black Star

7

Obsidian Tide

Pillars Of Creation

6

Obsolete

Animate//Isolate

7

Obstetra

Nuclear Powerviolence

6

Occlith

Gates, Doorways, And Endings

6

Occulsed

Crepitation Of Phlegethon	6
Parturition Of Adulteration	5

Occult Burial

Burning Eerie Lore

7

Ocean Of Grief

Nightfall's Lament

6

Oceans

The Sun And The Cold

6

Oceans Of Sadness

The Arrogance Of Ignorance	6
Mirror Palace	6

Oceans Of Slumber

The Banished Heart

7

Oceanwake

Lights Flashing In Mute Scenery

6

Octoploid

Beyond The Aeons

6

Odinfist

Remade In Steel

5

Odious Mortem

Synesthesia

7

Odraza

Rzeczom

7

Of Feather And Bone

Sulfuric Disintegration

7

Offerbeest

Afrika

6

Officium Triste

The Death Of Gaia

7

Ogre

Thrice As Strong

6

Oh, Sleeper

Bloodied / Unbowed

7

Okkultist

O​.​M​.​E​.​N.

6

Olamot

Path Of Divinity

7

Olathia

The Forest Witch

7

Old

Down With The Nails

6

Old Nick

Crisp Winter Dawn Of My Night Moon [EP]

7

Oldd Wvrms

Codex Tenebris

6

Olhava

Sacrifice

7

Olkoth

At The Eye Of Chaos

6

Om

Conference Of The Birds	8
Advaitic Songs	7

Omb

SwineSong

7

Omegavortex

Black Abomination Spawn

7

Omen

Battle Cry	7
Warning Of Danger	7
The Curse	6

Omicida

Sacrifice The Bastard Son	7
Defrauded Reign	6

Ominous Scriptures

Rituals Of Mass Self​-​Ignition

6

Omission

Disciples Of Ravens Vengeance

6

Omit

Medusa Truth, Part 2

8

Omnerod

The Amensal Rise

6

Omnium Gatherum

The Burning Cold

7

Omnivortex

Circulate	7
Diagrams Of Consciousness	6

On Thorns I Lay

Aegean Sorrow	7
Threnos	7
On Thorns I Lay	7

Once Human

Scar Weaver	7
The Life I Remember	5

Ondskapt

Grimoire Ordo Devus

7

Oneiric Eclipse

Oneiric Eclipse

7

Oni

The Silver Line

6

Onirik

The Fire Cult Beyond Eternity

7

Onmyo-Za

金剛九尾	9
鬼子母神	7
鳳翼麟瞳	6
夢幻泡影	6
臥龍點睛	6
魔王戴天	6
魑魅魍魎	6
風神界逅	6
雷神創世	6
迦陵頻伽	5
覇道明王	5
龍凰童子	5

Onslaught

Power From Hell	6
The Force	5