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I'm a big fan of fan theories (e.g., Harry Potter having never went to Hogwarts) and was wondering if there are any good ones you all had/have heard of in the 40k universe.

One of my favorites is that the Necron/C'tan are playing a very long-term game for eventual supremacy that's coming to fruition by manipulating other races, notably humanity. This includes being the source of the Pariah gene (so they can combat psykers by harvesting humans), creating the Cult Mechanicus (in the image of the Void Dragon), and playing the Eldar's Laughing God (being the C'tan Deceiver in another imagining).

With the possible exception of the Deciever/Cegorach, that's not so much a headcanon/theory as old fluff that hasn't quite been retconned out fully, lol.

My favourite bit of headcannon -
http://www.dakkadakka.com/dakkaforum/posts/list/613298.page

TLDR -
The Fire Hawks, who became the LOTD, found a stable warp current that takes them back in time which is how/why they can appear exactly where and when they're needed to turn the tide.

 Otto Weston wrote:
My favourite bit of headcannon -
http://www.dakkadakka.com/dakkaforum/posts/list/613298.page

TLDR -
The Fire Hawks, who became the LOTD, found a stable warp current that takes them back in time which is how/why they can appear exactly where and when they're needed to turn the tide.

Hands down, still one of the best pieces of speculation I've ever seen. I wish there was more like this.

FM Argos

I've seen it appear once or twice but one I've always found fascinating is the Emperor's relationship with the Void Dragon. The idea was that the Emperor fought and trapped the Void Dragon to gain information on Necron technology; specifically, the technology behind a dolmen gate. As we know, dolmen gates are used to open a path into the webway. We also know that the Emperor was building a agteway into the webway, the exact same function as a dolmen gate. Perhaps the emperor used Necron technology to build his own gate, taking the information from the Void Dragon.

My friend believes that the Grey Knights originally came from the Thousand Sons. Makes sense I think, considering how every GK is a psyker, and I'm pretty sure every TS was aswell. Also how they both had a little thing for collecting knowledge and whatnot, I think it's pretty reasonable.

As for the Fire Hawks being the Lotd thing, that creeped me out for some reason. I'm sitting here with goosebumps lol. Very interesting theory :p

123ply wrote:
My friend believes that the Grey Knights originally came from the Thousand Sons. Makes sense I think, considering how every GK is a psyker, and I'm pretty sure every TS was aswell. Also how they both had a little thing for collecting knowledge and whatnot, I think it's pretty reasonable.

As for the Fire Hawks being the Lotd thing, that creeped me out for some reason. I'm sitting here with goosebumps lol. Very interesting theory :p

Are you sure he wasn't talking Blood Ravens?

123ply wrote:
My friend believes that the Grey Knights originally came from the Thousand Sons. Makes sense I think, considering how every GK is a psyker, and I'm pretty sure every TS was aswell. Also how they both had a little thing for collecting knowledge and whatnot, I think it's pretty reasonable.

As for the Fire Hawks being the Lotd thing, that creeped me out for some reason. I'm sitting here with goosebumps lol. Very interesting theory :p

Problem with that theory is that it's been debunked by the revelation of the origins of the geneseed of the GK.

Mr Nobody wrote:I've seen it appear once or twice but one I've always found fascinating is the Emperor's relationship with the Void Dragon. The idea was that the Emperor fought and trapped the Void Dragon to gain information on Necron technology; specifically, the technology behind a dolmen gate. As we know, dolmen gates are used to open a path into the webway. We also know that the Emperor was building a agteway into the webway, the exact same function as a dolmen gate. Perhaps the emperor used Necron technology to build his own gate, taking the information from the Void Dragon.

Only problem with that is that the Dolmen Gates weren't created as a concept until much later, and the DAoT tech looks nothing like Necron tech. We also have evidence that the nature of Dolmen Gates has been retconned.

123ply wrote:My friend believes that the Grey Knights originally came from the Thousand Sons. Makes sense I think, considering how every GK is a psyker, and I'm pretty sure every TS was aswell. Also how they both had a little thing for collecting knowledge and whatnot, I think it's pretty reasonable.

As for the Fire Hawks being the Lotd thing, that creeped me out for some reason. I'm sitting here with goosebumps lol. Very interesting theory :p

The, uh, no. Not every Thousand Sons was a psyker. If every Thousand Sons marine was a psyker, there wouldn't be any Rubrics.

@Furyou: What's the new nature of the Dolmen Gates, if I might ask, I didn't realize they'd changed. I presume something's then said or implied about them in the newest Necron Codex?

The Dolmen Gates are referenced in the new codex only as something that allows Necrons to Deep Strike.

The previous Dolmen Gate fluff states that they were used to tear holes into the webway, allowing Necrons to enter or exit it - basically, they need a Dolmen Gate at both ends of their transit to use the Webway. It never made any sense because supposedly starships were using them, but the only gate we ever actually saw was some kind of platform in a cave (incidentally, that dolmen gate was never described as using the webway at all).

The new codex' only mention of a Dolmen Gate is as part of a fluff segment that describes Monoliths and Infantry appearing, oldcron style, in a flare of green lightning in an empty field.

 Otto Weston wrote:
My favourite bit of headcannon -
http://www.dakkadakka.com/dakkaforum/posts/list/613298.page

TLDR -
The Fire Hawks, who became the LOTD, found a stable warp current that takes them back in time which is how/why they can appear exactly where and when they're needed to turn the tide.

If that was the case, why wouldn't they tell members of the Inquisition, and explain the situation.
The Inquisition could then go back in time and warn the Emperor. Or stop Horus from becoming corrupted.
Even if they couldn't go back that far they could still stop a lot of horrible events, loss of worlds and such, that the LoTD don't know about, from happening.
Don't give me that "The Inquisition would just Exterminatus the LoTD, blah blah blah".
There are Loads of Inquisitors who have no problem in using Chaos to their own ends.
Its expressed in their codex, where it's stated in Coetaz's section that most inquisitors use the warp to extend their lifespans, and Coetaz is afraid to.
Even if was true that NO inquisitor would help them, they could still go back in time and help the Emperor by warning him about the future.
I imagine the most powerful psyker in the world would be able to understand that.
And wouldn't a stable time-travelling stream in the warp be the most valuable commodity ever.
Tzeentch would have that crap on lock.
Its way easier to explain it as ghosts or daemons of the God-Emperor.
It explains the regeneration, the knowing exactly where to be, the weird warp-fire, the fact that their bolters don't emit real smoke or flamers lack of gas smell.
Your gear operating differently from the known rules of the universe cannot explained by a gene-seed mutation, unless they have literally become Warp Creatures similar to non-affiliated Daemon Princes.
In which case they're basically Emperors-Daemons anyways, the were just human once apoun a time.

 Mantorok wrote:

 Otto Weston wrote:
My favourite bit of headcannon -
http://www.dakkadakka.com/dakkaforum/posts/list/613298.page

TLDR -
The Fire Hawks, who became the LOTD, found a stable warp current that takes them back in time which is how/why they can appear exactly where and when they're needed to turn the tide.

If that was the case, why wouldn't they tell members of the Inquisition, and explain the situation.
The Inquisition could then go back in time and warn the Emperor. Or stop Horus from becoming corrupted.
Even if they couldn't go back that far they could still stop a lot of horrible events, loss of worlds and such, that the LoTD don't know about, from happening.
Don't give me that "The Inquisition would just Exterminatus the LoTD, blah blah blah".
There are Loads of Inquisitors who have no problem in using Chaos to their own ends.
Its expressed in their codex, where it's stated in Coetaz's section that most inquisitors use the warp to extend their lifespans, and Coetaz is afraid to.
Even if was true that NO inquisitor would help them, they could still go back in time and help the Emperor by warning him about the future.
I imagine the most powerful psyker in the world would be able to understand that.
And wouldn't a stable time-travelling stream in the warp be the most valuable commodity ever.
Tzeentch would have that crap on lock.
Its way easier to explain it as ghosts or daemons of the God-Emperor.
It explains the regeneration, the knowing exactly where to be, the weird warp-fire, the fact that their bolters don't emit real smoke or flamers lack of gas smell.
Your gear operating differently from the known rules of the universe cannot explained by a gene-seed mutation, unless they have literally become Warp Creatures similar to non-affiliated Daemon Princes.
In which case they're basically Emperors-Daemons anyways, the were just human once apoun a time.

Finish reading my article before attempting to refute it-
I postulate as to why they haven't told the Imperium at large and also why they didn't go back to the Horus Heresy etc.

 Otto Weston wrote:

Finish reading my article before attempting to refute it-
I postulate as to why they haven't told the Imperium at large and also why they didn't go back to the Horus Heresy etc.

You are correct. I apologize.

 Mantorok wrote:

 Otto Weston wrote:

Finish reading my article before attempting to refute it-
I postulate as to why they haven't told the Imperium at large and also why they didn't go back to the Horus Heresy etc.

You are correct. I apologize.

No problem, no harm done

The Emperor always knew that he would require Magnus to sit on the Golden Throne, even before he had begun to build it. Realising that the bond between Primarch and Legion would be like the bond between father and son he orchestrated the demise of his Legion, much like he did the Thunder Warriors. The Thousand Sons were created with unstable gene seed that would either lead to their destruction due to taint at the hands of another Legion or by their own rampant mutation. Having no Legion to care for Magnus would be downtrodden and without meaning. The Emperor would give him something to believe in once more.

The Emperor foresaw the relevance of the slaughter on Nuceria and what it would lead to should he allow Angron to continue the fight. Rather than let Angron become the Blood Gods Son before he had even tried to bring his Primarch child under his wing he abducted him to give Angron a chance of a normal(ish) life or at least delay his inevitable ascension to Daemon Prince. Angrons fate had always been determined on Nuceria.

At some point some random Ork prayed really hard to Mork (or was it Gork) that the Orks would always have something to fight. Gork (or was it Mork) heard this Ork's prayer and answered by sending the Tyranids.

 Furyou Miko wrote:

The previous Dolmen Gate fluff states that they were used to tear holes into the webway, allowing Necrons to enter or exit it - basically, they need a Dolmen Gate at both ends of their transit to use the Webway. It never made any sense because supposedly starships were using them, but the only gate we ever actually saw was some kind of platform in a cave (incidentally, that dolmen gate was never described as using the webway at all).

Starships can have gates as well. They would just require rather larger gates than infantry.
We saw a Dolmen Gate in Hammer and Anvil and that was webway based.
We also saw that wormholes like the Monolith's infinity gate are a crude version of the webway

 Furyou Miko wrote:

The new codex' only mention of a Dolmen Gate is as part of a fluff segment that describes Monoliths and Infantry appearing, oldcron style, in a flare of green lightning in an empty field.

Not quite right.

Codex Necrons wrote:Another strobing pulse of plasma fire tore across the Necron lines, ripping molten fragments from ranks of living metal warriors. Out in the azure haze, puppet-like wraithbone constructs and agile Eldar Guardians stalked toward the phalanx of Necron Warriors clustered around the flickering dolmen gate. Then, from out of the rippling portal, a Monolith tore into reality

As we can see here the Necrons start clustered around the Dolmen Gate which implies some permanency as they've had time to take up position around it.
Then the Monolith emerges from the Gate rather than from a flash of green lightning.
This seems to suggest they function in much the same way as they did before and as webway gates work.