Deag Grav

"If Sentinel holy blood is spilled on these grounds... you will lose all sovereignty here!"

- Deag Grav, taunting the Doom Slayer

Deag Grav is a Hell Priest and one of three coordinating the demonic invasion of Earth at the behest of the Khan Maykr. He is first mentioned in Doom (2016) and appears as an antagonist in Doom Eternal.

History
Originally a priest of the Order Deag, he created a scheme to ensure total victory over the realm of Argent D'Nur by making a false promise to a Night Sentinel that he would resurrect his fallen son in exchange for his help in enabling him and his cabal to gain access to the Wraiths in the Sepulcher of Elements. Once the treacherous Sentinel did his job, the Hell Priest and his cabal siphoned the Wraiths' own essence to the Well that gave Hell the advantage in the war and finally absorbed the dimension of the Night Sentinels. While Grav fulfilled his promise after a fashion, he instead used the heart of the Betrayer's son to resurrect him in the form of the Icon of Sin.

Thereafter, Grav lord over Argent D'Nur and turning the Arena into a bloodsport, pitting humans against demons to entertain himself and the populace that remained loyal to the Khan Maykr.

Doom Eternal
During the demonic invasion of Earth, Deag Grav and his fellow Hell Priests oversaw the invasion. When Deag Nilox and Ranak died at the hands of the Doom Slayer, Grav fled to Sentinel Prime.

When the Slayer came for him at the Arena, Grav unleashed The Gladiator upon the Slayer. However, the Slayer slaughtered Grav's demonic guardian. Grav spitefully tells the Slayer that killing him will not stop the consumption of Earth before shortly having his head blown away by the Slayer's shotgun.