Erebus

Doom Classic
Mount Erebus is a location in Hell that the Doom Marine fought through.

In Greek mythology, Erebus is the mysterious darkness through which the souls of hte dead pass on their way to Hades. Personified, Erebus was the son of Chaos and brother of the Night (Nyx). Mount Erebus is also the name of a volcano. Mount Erebus is an infernal location in Hell. Mount Erebus resembles a faceted jewel, the mountain almost seems to glitter wiht irregular prisms of bouncing light. The entire mountain floats on a lake of perncious red ooze. Explorers can find access to Hell's Warrens from this mountain.

Doom 3
Erebus is a location in Site 1 named after "Erebus". It includes Erebus Station, Erebus Dig Site, Erebus Labs, Erebus Control, and several other ressearch and escavation sites.

Doom (2016)
Site 1 dig sites and escavations were the location where Night Sentinel statues were recovered.

Doom Eternal
Erebus, also known as the Keeper of the Spire City of Dis or Slavemaster of the Dammed is one of the Archdemons that serve the Dark Lord. He ruled over Babel. The most despicable and vile of all the Archdemons, he rules over the cursed souls of Hell who are damned to labor for eternity. Like the all the Archdemons, he answers to no one beside the Dark Lord.