Hell priest

The Hell priests are three corrupted Night Sentinels of once-holy blood who can control and coordinate the actions of demons, and are used by the Khan Maykr as catspaws as she cannot directly control the forces of Hell. All three bear the title of "Deag", which presumably means "priest" in the Sentinel language. Their lifespan is extended indefinitely by placing their souls into special medallions; however, the Doom Slayer acquires these medallions, allowing him to kill them. They do not have any special abilities that would allow them to be a combat challenge for the Doom Slayer, and therefore are not considered to be boss monsters. They can however teleport by saying "Calomus V Turna."

In the far past, the Hell priests were members of a holy order of Argenta priests, known as the Order of the Deag, who first worshipped and studied the Elemental Wraiths, but later dedicated themselves to service of the Maykrs after contact between their species was made at the end of the Time of Grief. Once the Khan Maykr made her deal with Hell for the acquisition of Argent energy, many of the Order's members followed her and betrayed their own people. Despite this betrayal, described as a "violation of the Covenant" by King Novik, Sentinel law was never revised, and still protects them due to their former status.

When taking part in battle, the Hell priests ride in Hell barges, moveable temples which are carried by eponymous Titans. From these command posts, they broadcast powerful psionic waves which bolster the strength and coordination of Hell's armies. The Hell barges are invulnerable to all conventional weaponry, but their psychic link to the Hell priests means that of any of them die their corresponding Hell barge will die with them.

At the beginning of the Doom Slayer's campaign in Doom Eternal, the three Hell priests are nearing the completion of a blood ritual to permanently consume the Earth and join it with Hell. All three must be eliminated in order to stop what has been set in motion.

Known Hell priests
The Hell priests are:
 * Deag Nilox
 * The first Hell priest encountered in the game. Wears a crown. He panics when the Doom Slayer shows him he has his medallion, and is quickly executed afterwards, by being choked until his head separated. The Doom Slayer carries his severed head to the "Deagic Council", prompting the other two Hell priests first to protest, and then to leave by teleporting away when threatened by the Slayer.


 * Deag Ranak
 * The second Hell priest. Wears a face-concealing headpiece. The most inventive of the Hell priests, he seeks to defend himself from the Slayer by creating the Doom hunters. He is also responsible for contacting and corrupting Olivia Pierce and took over the UAC cultist divisions after her death. He tried to buy his survival from Slayer by offering him "gifts to aid him", but was decapitated.


 * Deag Grav
 * The last Hell priest, responsible for resurrecting the Betrayer’s son in the form of the Icon of Sin and the fall of Argent D'Nur. Wears a small headpiece resembling a diadem. After the Slayer executed the first two priests, the Khan Maykr evacuated him from Earth and hid him on Sentinel Prime. He is apparently able to direct demon activity on Earth from this remote planet. It is said he organized bloodsport in the arena. He left his medallion in the guard of the Gladiator, allowing the Slayer to recover it after defeating the demon. By killing Deag Grav in the Arena, the Slayer becomes an outcast on Sentinel Prime and must flee it precipitously.

Trivia

 * Deag also means "day" in the language.