Obsidian Grave

Black Metal

4 Albums

Obsidian Hooves

Death Metal

1 Album

Obsidian Tongue

Atmospheric Black Metal

6 Albums

Obsolete

Technical Death Metal

2 Albums

Occlith

Doom Metal

2 Albums

Occulsed

Death Metal

2 Albums

Occultation

Doom Metal

2 Albums

Occultist

Thrash Metal

1 Album

Oceano

Metalcore

6 Albums

Ocean of Ghosts

Metal

7 Albums

Oceans of Slumber

Progressive Metal

7 Albums

Octavision

Metal

1 Album

October 31

Heavy Metal

7 Albums

October Noir

Metal

4 Albums

October Thorns

Progressive Metal

1 Album

Octopus Triangle

Progressive Metal

1 Album

Oddko

Industrial Metal

1 Album

Odd Logic

Progressive Metal

8 Albums

Odd Project

Metalcore

5 Albums

Odin

Heavy Metal

2 Albums

Odious Mortem

Technical Death Metal

3 Albums

Odious Sanction

Death Metal

3 Albums

Odious Spirit

Death Metal

1 Album

Odyssey

Progressive Metal

8 Albums