O
Oathean
Obitus
Obliteration
Obscurcis Romancia
Obscure Devotion
Obscurity
Obscuro
Obscurus
Obsidian Gate
Obskurum
Occult
Occultus
Ocultan
Odal
Odem Arcarum
Odium Immortalis
Olc Sinnsir
Old Mans Child
Old Pagan
Omendark
Ominous Grief
Ondrim
Ondskapt
Ondske
One Master
Onheil
Onirik
Oniromancia
Open Grave
Opera IX
Operation Winter Mist
Opus Draconis
Opus Forgotten
Orakle
Orcrist
Orcustus
Ordo Draconis
Ördög
Orkus
Orlog
Osirion
Otargos
Ouroboros