This page is official Halo Fanon Wiki policy.

We here at Halo Fanon pride ourselves on our devotion to the official storyline, or "canon" of the Halo universe. All of the articles on this site must remain up to the standard set by canon; that is, they must fit in with officially-released media in a way that does not contradict or conflict with the previously-established universe. However, many users are confused as to what is considered actual canon, and what is considered embellishments on that storyline: what rules and events they must follow and what rules and events they can bend. That brings us to the existence of this page. It is here to clarify all of the questions and confusions you may have had about our site's policy and to help you better interact with the veteran users who already understand what is going on. While this was written predominantly for newcomers, it is also intended to be a resource for veterans who are unsure of a particular item's canonical status and wish to get clarification on the matter. With that being said, we hope that this will aid you in your quest to write newer and more creative fan fiction that fits in well with the scope of the Haloverse. Happy editing!


So, with Bungie's departure from the Halo franchise and the series's transfer into the hands of Microsoft-run 343 Industries, there has been quite a bit of concern with regards to what materials should be classified as "real" canon and what should be classified as "false" canon. All items released by Bungie and 343 are canon, and should be regarded as canon, as stated here. However, there are a few finer points that need better definition. Foremost among these are the precedence of one canon source above the other-- is Legends on the same level as Halo: Combat Evolved?, etc.-- and this is what this section is devoted to. Below is the policy that Bungie outlined here.

In short, Joseph Staten said that "Everything that Bungie has ever approved is canonical. But even then, certain things trump others. In order of canonical influence: The games rank first, published materials (books, comics, soundtrack liner notes etc.) rank second, marketing and PR materials third," and that "the more recent items trump the older ones. So, for example, if some aspect of Halo 3's fiction contradicted Halo 2's, Halo 3's would be the gold standard." With the site-wide integration of 343i canon in 2015, the Administration has updated this canon hierarchy:

Primary canon
(Halo: Combat Evolved, Halo 2, Halo 3, ODST, Reach, Halo 4 and Halo 5)*

Secondary Canon
Spinoff games
(Halo Wars, Halo Wars 2, Spartan Assault and Spartan Strike)


(The Fall of Reach, The Flood, First Strike, Ghost of Onyx, Contact Harvest, Cole Protocol, Evolutions, The Forerunner Saga, Kilo-Five Trilogy, Broken Circle, New Blood, Fractures, Legacy of Onyx, Smoke and Shadow, Envoy)


Live-Action Features
(Forward Unto Dawn, Nightfall, Halo TV Series)


Graphic novel and other media
(Halo Graphic Novel, Uprising, Helljumper, Blood Line, Fall of Reach Comic, Encyclopaedia, Genesis, Legends, Initiation, Escalation, Hunt the Truth, Mythos, Tales from Slipspace)


Marketing content
(ilovebees, Iris, We Are ODST, Remember Reach, etc)



  • * = denotes credibility over the duration of the contract.

Those are the fundamentals of the universe. But what are these tiers of canon? What does the Administration mean by Primary-canon, Secondary-canon and Fanon-canon?

Primary-canon (Tier One)
Primary-canon encompasses works within the main Halo universe created by both Bungie and 343 Industries. While in the past this tier only fell under works by Bungie, the status of 343i as the current main content producer of Halo material has warranted their elevation after several years of being regarded as a secondary source. This tier covers all of the mainline Halo games created by the two developers; as Halo is primarily a video game series, the games should be regarded as our primary source of canon. It covers all mainstream Halo games from 2001 onwards.
Secondary-canon (Tier Two)
Secondary-canon covers all expanded universe materials within the Halo franchise, including novels, comics and promotional items. This also covers games not created solely by either Bungie or 343i as part of the Halo FPS series. While all materials within this tier are still considered canon, they can be overwritten by later retcons to the series from games or other Halo material. However, this material is still considered beneath the main games in terms of canon hierarchy.
Fanon-canon (Tier Three)
Fanon-canon is simply fixed errors made in official canon by members of the Halo Fanon wiki. Fanon-canon is a very messy source of canon; it is not official and it changes as the Halo Universe expands and nothing is ever fixed. This form of canon some times ignore the hierarchy of canon, simply to fix the errors made in the Halo Universe. However, one should always be reminded that fanon-canon is no way of being fully superior over all other forms of official canon and that anything under fanon-canon can change at any time. For example, the Falcon is actually a tilt-rotor vehicle and not a helicopter. Despite this, canon still designates it as the UH-144. Fanon-canon would correct this to UV-144. If you don't fully understand the concept of fanon-canon, ignore it and simply focus on official canon.

The two top tiers of canon must be followed and adhered to more strictly, with less of a chance to bend the rules, while the lower two can be used to expand your universe or be more open to bending. "But what is this bending, you're talking about?" you may ask, and "how do I apply this hierarchy to my fanon?" Don't you worry, dear user. We are here to answer your questions.

Just remember these guidelines:
  1. Gameplay will not always represent Canon ― The Gameplay of Halo will not always match Canon, for example, the range and lethality of some weapons, or the ability to flip a 205 ton Elephant. Always treat gameplay as an element of the game world, like the pause menu, or matchmaking. A necessary construct to enable play, but not necessarily a canon element.
  2. Ambiguity is common in the Halo Universe and is categorized as "loopholes". ― This means that unless definite canon is given, this loophole can be exploited. Such an instance is the tinkering with number of surviving SPARTAN-IIs, a number which has not been expressly stated by Bungie. A great example of an article that exploits a loophole is SPARTAN-091, an article written by a former member of the Administration in which the SPARTAN is officially (and falsely) listed as Killed in Action by the Office of Naval Intelligence so that he is not present at the fall of Reach. However, please be careful in judging this ambiguity. Statements such as "Miranda Keyes was replaced by a body double" are certainly not ambiguous, and would be non-canon. Any uncertainty, please contact a member of the Administration.
  3. Primary-canon products are of higher canon than all other products. ― Any retroactive continuity introduced by Bungie or 343i will immediately take into effect. Such an instance is the first sighting of the Sangheili, which was originally said to be in 2552 (Fall of Reach) but was later changed to 2535 (Cole Protocol), and lastly to at least 2525 (Halo Wars). Any retroactive continuity introduced by others should be taken into consideration by using the logic/reality test.
  4. Review the product in question and dissect every detail. ― Categorize those details and then determine their canonical or non-canonical status: Are they in conflict with another product? Do they defy the laws of realism? Or do they fit in well with the established universe?

Canon Testing 101

So, we've got our base of fanon now. How do we go about applying this base to our articles in order to ensure that they are accurate in regards to the Haloverse? The answer lies in asking yourself a few key questions.

Does My Article Contradict Canon?

That is to say, does your article contain any events, organizations and characters that could not exist properly in-universe? Examples of such things would be a SPARTAN-II that was born after 2512, the revelation that Master Chief is secretly a girl with a voice modulator, or a vast alien empire that the UNSC encountered before the Covenant. All of these concepts contradict previously-established canon elements (all SPARTAN-IIs were around five when conscripted, Master Chief has been confirmed in all sources to be male, and the Covenant are the first aliens that Humanity has encountered) and would thus be considered Not Canon Friendly, a status hereafter referred to as NCF. If your article is determined to be NCF, you need to either prove that it is possible or change it quickly to avoid it being deleted or moved to namespace.

Is My Article God-Modded?

God-Modded. It refers to the cheat that many early videogames had that, when entered correctly, made the player invincible to all threats in the game, an immortal and indestructible warrior with unlimited ammunition and boundless energy. An article that is considered to be God-Modded (or GM) is one that seems incredibly over-powered. It may be realistic, but chances are that it is not, since everything in the known universe has some type of weakness. An example of a GM concept is a SPARTAN wearing a version of MJOLNIR that has rocket-launchers mounted on the shoulders, an impenetrable forcefield tied into its shield system, and an unlimited-power LASER attached to his gauntlet.

Is My Article Realistic?

Your article must adhere to the laws of physics and other plausible factors. The Halo universe is technically considered to be science fiction, not space fantasy. The difference between these two concepts is that science fiction has its roots in actual scientific theories and is not simply based upon the author's imagination of the future alone. All science fiction concepts must be able to exist naturally or be proven by scientific discovery. Outlandish articles and ridiculous concepts are also considered NCF, so it is important that you keep your articles up to this standard. For more information on this subject, the administration suggests that you check this excellent article out for all your getting-started needs: it's Specops306's Guide to Fanon and Fanfiction!

Is My Article Properly Halo-Related?

This may seem plainly obvious to most, but when writing an article on a website for Halo Fanfiction, one should make sure that it actually relates to the Halo universe. We have had occasions in the past where users have decided to dedicate a great deal of writing either set in the distant past or far future in times where absolutely nothing is known about the Haloverse, making their work seem more akin to original fiction with Halo elements than actual Halo fanon work. Ideally, most user's work should take place within acceptable boundaries of the known Haloverse. This generally includes:

  • Forerunner Conflicts (Forerunner-Precursor, Human, and Flood Wars.)
  • Early Covenant Conflicts (Sangheili-San'Shyuum War, Taming of the Lekgolo, Unggoy Rebellion etc.)
  • Interstellar Conflicts (Jovian Moons Campaign, Interplanetary War, Inner Colony Wars.)
  • The Insurrection (2400s-2525)
  • Human-Covenant War (2525-2553)
  • Post-War Conflicts (2553 and beyond.)

As such, Human conflicts prior to the Jovian Moons Campaign is highly discouraged. This is largely due to the close proximity to our current time and the general arguments that have followed interpretations by users in the past regarding how the near-future will pan out, in addition to their general irrelevance to the main story of Halo. The period following the Human-Covenant War is another somewhat open area, since at the time of writing Halo's in-game story is currently in late 2558, leaving the rest of the 26th Century's events open to interpretation. Writing post-war does generally give one a great deal of freedom in terms of fanon events and conflicts that are welcomed on the site, though users should be wary of going too far forward; anything beyond the mid-27th century (2650) tends to be a bit far in the opinion of most.

Further Asked Questions

This is the part of the Canon Policy page that addresses some of the most talked-about items on the site. Among these are the debate on whether Halo Legends is canon, whether or not it is appropriate to use Tier 0 technology, the number of SPARTANs, and the plausibility of having another SPARTAN program in the series.

Contradiction by new canon

AKA the Halo 3: Ascension problem

If you created an article in 2010 that after the events of Halo 3, Master Chief crashed on an abandoned Forerunner installation and had some whacky adventures that involved him finding a ship to escape back to earth. That would be acceptable under the canon policy at the time. When Halo 4 released, this article is no rendered non-canon. The general view on it is, if this article is left in-situ, and as is, then it remains canon-adherent, as this article is not required to adhere to canon. If the creator wished to continue editing after the release of Halo 4, then it would be required to make it Canon. This does not apply to edits to correct spelling mistakes, grammar mistakes, or coding errors.

A more apt real world example of this would be Halo 3: Ascension. Written in the days before the release of Halo 3, Halo 4 Ascension was on writer's interpretation of the third Halo game. Because of the release of Halo 3, it is no longer canon under the existing policy. However, as long as the writer does not edit it any further, i.e. add a new chapter, then it remains acceptable under the canon policy.

Halo Legends

Perhaps the most frequently asked query is the canonical nature of Halo Legends. Many have questioned against its rather loose interpretation of Halo canon, and the many errors it made in its development, and in most cases, they are correct. However, it is actual canon material, and should be accepted as such.

Tier 0

Another topic of contention that has been hotly debated amongst the users of this site is the concept of Tier Zero technology, the highest point on the Halo Universe's scale of sentience. Tier 0 species are referred to as "Transsentient," having been able to rise above the very bounds of reality itself. But, to quote Halopedia, "As the Forerunners had no examples of civilizations with technological accomplishments greater than themselves - with the exception of the Precursors - this is a theoretical ceiling. It is suspected that they can travel across galaxies and accelerate the evolution of intelligent life."

With the onset of this classification of technology, there have been more than a few concerns regarding the legality of having a Tier 0-based article that may or may not break several of the site's rules. Therefore, the Administration has decided on the following policy regarding Tier 0:

If a user wishes to create a Tier 0 species/technology, it cannot:

A. Step beyond the bounds of reasonable realism

This means that there can be no ridiculously implausible technologies or species, ones that can kill a man with a single glance, or destroy all matter in the cosmos, or create matter from thin air. Long story short, if it's obviously god-modded or overpowered without a grounding in applied scientific law or theories, it's going to be tagged as such.

B. Break the laws of physics

As is stated by the laws of physics, matter is conserved, and cannot be destroyed or created; only modified. So if your article decides that it can literally make something from thin air or reduce it to nothingness (literally), it's way too impossible, and will be summarily flagged as NCF. If anything goes completely outside the laws of physics, barring the exceptions made specifically for the Halo Universe by its creators (i.e. Slipspace), then it falls under this category.