Dominion of Darkness
The Pumping Station
Storage Facility
The Lost Mine
The Research Facility
Military
Complex
The Rift
Ancient Realms
The Black Cathedral
The Catacombs
The Crypt
Mortum's Keep
The Gremlin's Domain
The Lair
Tur Torment
Pandemonium
Limbo
The Gauntlet
Armagon's Domain
Armagon's Domain
The following are just a few screenshots I really liked, thought I'd go ahead and add them to the rest here...
Portal Discovery
Portal Discovery(cont.)
Power Generator
Power Generator(cont.)
Armagon's Defeat
The End...