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The Night Sentinels were the guardians of the Wraiths and acted as both their holy servants and a bridle for their awesome power. These guardians were imbued with Wraith energy and proved fierce opponents of Hell's legions and, according to the Ungmar Codex, almost triumphed over Hell but were betrayed by a member of their order. The unnamed Betrayer struck a bargain with a lowly Hell priest, Daeg Grav, for the return of his son who had been lost in battle, and he led the priest and his cabal to the source of the Night Sentinels' power, the Elemental Wraiths. Daeg Grav cursed the Wraiths while they slept, and the Hell priests stole their energy for their own devices. Argent D'Nur was defeated, and their realm absorbed by Hell, along with the Argent energy that led to the creation of The Well.
Giant statues of the sentinels can be seen in Argent D'Nur, while two smaller statues labeled 'Ancient Sentinel' can be found in Samuel Hayden's office either side of a statue of the Praetor Suit.
The Sentinels are somehow connected to the Doom Slayer, as their souls often act as his guide during his journey through hell. While little is known for certain about the Night Sentinels, some have speculated that:
- The Doom Slayer was originally a member or perhaps leader of the order and is now the last of their kind.
- Others have suggested that they guide the Doom Slayer out of either respect for releasing the Wraith's souls, or out of having a mutual enemy in Hell's legions.
- Stone tablets and other "artifacts" in-game commonly depict the Doom Slayer and the Knight Sentinels fighting together, indicating that they have met before. The Doom Slayer's armor is very different; however, and he may simply have aided them in fending off the demon hordes.
Either way, the souls of the Knight Sentinels appear to the Doom Slayer at various points throughout Hell to point the way or stand in solidarity with him.
- In Multiplayer, Players can use the Templar Armor, the wearable equivalent of the Knight Sentinel armor.
- The Armor that the Knight Sentinels use is visually inspired by 15th Century Gothic Plate Armor, used by the Holy Roman Empire.
- Their Helmets are also inspired by the Great Helm, which was used by 13th - 16th Century European Knights.