Erebus the Dark is a kreegan deity mentioned in Heroes of Might and Magic III: Armageddon's Blade.
In the Maker of Sorrows scenario of the Armageddon's Blade campaign, a tavern rumor told players that "The Kreegans worship dark gods like Erebus, the God of Darkness and Destruction."
In the same scenario, Xyron learned that Queen Catherine was marching on Kreelah. Full of rage, he proclaimed "Know this Catherine Ironfist, I shall have my revenge. I swear by Erebus the Dark I will flay the skin from your child's bones as you watch."
The order of demoniacs and heretics known as the Sons of Erebus were named after him.