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Sentinel Prime is the eighth level of the campaign in Doom Eternal. In it there are pickups detailing the story of Argent D'Nur and the Slayer as he fought with them against the demons.

At the end there is the Gladiator as a boss fight. There is no Slayer Gate or Secret Encounters in this level. This level is also unique in the game for not containing any battles at all except for the boss fight.


You've traveled through the core of Mars, arriving at the ancient city of Sentinel Prime. You have sovereignty in this unholy place... for now. The great Slayer was once a warrior king in this world - tradition grants you safe passage but the completion of your mission will come at a price. Hell Priest Grav is waiting.


The Slayer arrives at Sentinel Prime. As he begins exploring the once holy city, he experiences flashbacks to the first time he arrived on Argent D'Nur - back when he was still Doomguy. He had been found badly wounded by the Sentinels, who brought him before the Deag Priests. Recognizing that the Doomguy still had fight in him, the Priests forced him to battle in the arena. The Doomguy beat all of his opponents, but he wouldn't stop ranting about demons and his need to kill them all. The Khan Maykr witnessed this and ordered the priests to bring the Doom Slayer to her so she could learn more about the demons.

Back in the present, the Khan Maykr attempts to persuade the Slayer give up his fight to save Earth. She even offers to restore what the demons took from him long ago if he stops his quest. The Slayer is undeterred and proceeds into the arena where he confronts Deag Grav. Grav mocks the Slayer and says that if he (the Slayer) spills Sentinel blood here, the Slayer will lose all sovereignty on this world. The Hell Priest then unleashes the Gladiator on the Slayer. After a vicious battle, the Slayer triumphs. Still thinking the Slayer won't kill him, Grav starts to mock him again, but the Slayer blows his head off in mid-sentence with the Super shotgun. With the third and final Hell Priest dead, the demonic consumption of Earth is brought to a halt.

The Khan Maykr is infuriated by the Slayer's actions and the Sentinel guards turn against him. VEGA opens a portal and the Slayer escapes through it. She attacks the Fortress of Doom, leaving a number of fodder demons behind and knocking out the power; the Slayer restores power using the Crucible.


Mission challenges[]

There are no mission challenges for this level.


  • Colosseum

Fast Travel Locations[]

  • Holy Pathway
  • Altar
  • Training Hall
  • Dungeons


Icon Name Description Gamer Score Trophy
Thumbs Down Thumbs Down Best the Gladiator in the colosseum 25 Silver





  • Sentinel Prime appears to be in the same world as Exultia, with similar architecture. When the Slayer arrives, Mars, or a Mars-like moon, may be seen looming in one part of the sky. (This type of celestial object may also be seen in Kadingir Sanctum.)
  • The mournful music that starts playing when the Slayer enters the pavilion and relives his first memory with the Argenta is a better-orchestrated version of the music in "Phobos Anomaly," the last level of Knee-Deep in the Dead, albeit without the melody.
  • The Gladiator appears to be a rough equivalent of the Cyberdemon in DOOM. Both are two-round boss fights against a tough opponent with a wide variety of attacks, and occur at a similar stage of the game.

See also[]