Guardian Sentinel

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This article's title is a callsign, an alias, or a nickname, as no proper name for the subject has been revealed.
This article is about the Forerunner Sentinel. For other uses, see Guardian (disambiguation).
Guardian Sentinel
The Halo 3 Guardian Sentinel as recreated by the Digsite team.


Defense of Forerunner installations


Guardian Sentinels are a Forerunner construct created prior to the firing of the Halo Array.[1]



Holograms of these constructs were displayed in structures on Installation 00[1] and the Silent Auditorium of Installation 07.

Cortana's interpretation[edit]

By 2556, when John-117 and Cortana was stranded in space after the Battle of Installation 00, Cortana interpreted these constructs around Strato-Sentinels, and as escorts for a Keyship at the Portal at Voi during the Forerunners war against the Flood.[2]

Production notes[edit]

The Guardians have a storied history with the Halo series, with their core idea dating back to the development of Halo 2. Notably, the Guardians were heavily developed for Halo 3, with many pieces of concept art created for their design. The Guardians were to feature in the eponymous level Guardian Forest as enemies, with a model and animations being created for them, and the in-game character in iteration. In the level, the player would have been able to rip out the Guardian's "eye" and use it as a laser weapon.[3][4] Information provided by the Digsite team's efforts to restore the Guardian indicate that it was capable of teleportation and a repulsion field similar to 343 Guilty Spark. [5] Unfortunately, the level and the Guardian enemy had to be cut, with the level being repurposed as the Guardian multiplayer map and the Guardian enemy model itself used on Epitaph in holographic form. While not seen in the final game, their design was later used in Origins for two Forerunner constructs seen escorting a Keyship to the Portal at Voi.[2] The Guardian hologram reappears in Halo Infinite.[6] The Halo Encyclopedia (2022 edition) reveals that the holograms of the Guardian Sentinels were repurposed as in-universe holographic representations of Offensive Bias.

Additional information provided by Halo 3 Campaign Environment Lead Chris Barrett, who is cited as being the creator of the Guardians, reveals that the Guardian had two states, a regular and a "deployed" state, the deployed state being ultimately repurposed as the Epitaph hologram in the final game. [7] Jaime Griesemer would also provide information comparing their intended movement design to that of the Compilers from Marathon. [8] Vic DeLeon has suggested that the Guardian was intended to be similar in size to the similarly-cut Strato-Sentinels;[9] however, the model used on Epitaph is much more reasonably sized closer to a standard Sentinel - something which matches their suggested use in-game. This is supported by the ongoing work of the Digsite project Guardian restoration - indicating DeLeon may have misremembered these details.[10]

Design documents uploaded online by campaign design lead Rob Stokes indicated the Guardians were considered at various stages of development to appear in some form in the levels The Ark, Guardian Forest, Alpine, Forerunner City, and Halo.[11]

According to Art of Halo 3, "The Guardian evokes memories of Compilers (from one of Bungie's previous games, Marathon) and the robes of a High Court Judge - which is fitting because, as anyone who has encountered them can tell you, their judgments are swift and final, and their logic utterly alien."[12]


Concept art[edit]

Halo 3[edit]

Halo Legends[edit]

Halo Infinite[edit]

List of appearances[edit]


  1. ^ a b Halo 3, multiplayer map Epitaph
  2. ^ a b Halo Legends, episode Origins
  3. ^ GDC Vault, Building Your Airplane While Flying: Production at Bungie (Retrieved on Jun 1, 2020) [archive]
  4. ^, Building Your Airplane While Flying: Production at Bungie: Original presentation download (Retrieved on Jun 1, 2020) [archive]
  5. ^ Halo Waypoint, Digsite Discoveries (Retrieved on Sep 17, 2023) [archive]
  6. ^ Halo Waypoint, Inside Infinite - April 2021 (Retrieved on Apr 30, 2021) [archive]
  7. ^ Twitter, Christopher Barrett (Retrieved on Jun 11, 2023) [archive]
  8. ^ Twitter, Jaime Griesemer: "My recollection is that they moved like the Compilers from Marathon." (Retrieved on Jun 11, 2023) [archive]
  9. ^ Twitter, Vic DeLeon: "Fwiw this is almost exactly what the Guardians looked like back when they were first imagined on Halo 2, only they were much larger, almost like the Strato-Sentinel." (Retrieved on Jun 1, 2020) [archive]
  10. ^ Twitter, Krevil (@Pyrosocial1): "@game_fabricator Hi Marcus, the Digsite team is working on remaking the Guardian and we were wondering if you might know if it was able to fly or hover? We don't have the original tags, only the source data. Here's an image of our WIP if that helps" (Retrieved on Jun 13, 2023) [archive]
  11. ^ Work of Rob Stokes, Halo 3 (Retrieved on May 25, 2023) [archive]
  12. ^ The Art of Halo 3 - With Friends Like These, page 31