Psykers evolution/Star child theory

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**Morgasm the Powerfull**

Another reason it failed was just the mind bogglingly ludicrously vast vast vast VAST, vast size of our galaxy. Milky way has like 200 to 400 billion, not million, BILLION stars. To top that off the observable universe has by current estimate anywhere from 200 billion to 2 trillion galaxies.

One misconseption that is strong among the fanbase seems to be that Imperiums of Man had conquered the galaxy at the end of the GC, In truth they had just united most of the humans they could find at that moment and reach on stable Warp currents. A few million worlds is drop in the ocean compared to the whole galaxy.And as the saying goes, there always a bigger fish.

Universe is just too big to be ruled by any one entity and those who try it will all eventually fail and fall, one way or another. Old Ones, Necrons,Original Mon-keigh, Eldar, none could rule the galaxy forever. Imperiums never been even close to their level and in an effort to get there it would sooner or later crumble apart. It's just too much to handle.

At the same time those who don't care about such things like the Orks, Jokaero, Kroot are doing just fine.

Moral of the story, don't try and take over the universe, it won't happen and you'll just fall on your face and cry, or end up on a golden toilet, watching as all your meager efforts are flushed down the drain.

**Andykp**

Grey Templar wrote:
I think the general idea was something like this.

Goal: A future where all of mankind is psychic and lives in peace, having dominated the entire universe.

Main Obstacle: Chaos entities feed on the emotions of sentient beings, and inhabit/control the Warp which is the source of psychic power.

So you have to cleanse the warp of these evil entities. The solution the Emperor came up with was to starve them by ridding humanity of all religion, superstition, and a general reduction of emotions. While also exterminating the Xenos, both because they too could feed Chaos and because they are also threat to humanity. The suppression of Psykers was also important here because, while the Emperor's ultimate goal for humanity, they were also an obstacle to ridding the Warp of Chaos because of their direct link to it. They could reveal the existence of Chaos and thereby keep the plan from working.

Then, once the Warp was starved and the 4 Great Powers dwindled, the Emperor could slowly bring about his psyker eugenics plan.

The only reason the plan failed was because the Emperor played his cards too close to his chest and didn't share the plan with the Primarchs. If they had known about Chaos upfront, it is unlikely that any of them would have been corrupted. The daemons couldn't have used the Emperor's distrust of his sons as a wedge to drive between them.

I agree with up until the end, I have to say I think the primarchs would’ve been tempted into turning if they had known about chaos. I still believe, like in the other thread that ignorance is a defence, if they had known they would’ve had to have a look. And the gods would’ve got their claws in one way or another. They were all to messed up with daddy issues not to tempted at some point. Unless the emperor had done other things differently too.

I think as well that the emperor believing he could defeat chaos and starve it by eradicating religion is an example of his arrogance and folly. It was never going to work and he was always going to lose. As above, the galaxy is too big and humans too fickle for it to have ever worked. But he still tried. Now if he comes back as the star child! Then we never know.

**Delvarus Centurion**

BobtheInquisitor wrote:
BrianDavion wrote:
BobtheInquisitor wrote:
Mellow wrote:
“Not that much”

Oh dear! Chaos was and is THE number one threat to Humanity.

I came in at 4th Edition, when Chaos was the least threatening faction, a total joke. #Notmywarhammer

In fairness, the weak performance of chaos on the table top etc as well as the lack of attention paid it was proably the biggest problem with 40k as a whole from 4th to early 7th. it wasn't until Warzone Fenris that you started to see chaos treated as the "serious actual threat" before that I always felt Tyranids had the most "actual real threat" build up.

For me, the Tyranids and Necrons are the two real existential threats, but the irony is that, because of their history together, the IOM and Chaos are too obsessed with each other to deal with them.

The thing is, the real extent to their danger is unknown, we don't know how many Tyranids or Necrons there actually are.

Automatically Appended Next Post:

Morgasm the Powerfull wrote:
Another reason it failed was just the mind bogglingly ludicrously vast vast vast VAST, vast size of our galaxy. Milky way has like 200 to 400 billion, not million, BILLION stars. To top that off the observable universe has by current estimate anywhere from 200 billion to 2 trillion galaxies.

One misconseption that is strong among the fanbase seems to be that Imperiums of Man had conquered the galaxy at the end of the GC, In truth they had just united most of the humans they could find at that moment and reach on stable Warp currents. A few million worlds is drop in the ocean compared to the whole galaxy.And as the saying goes, there always a bigger fish.

Universe is just too big to be ruled by any one entity and those who try it will all eventually fail and fall, one way or another. Old Ones, Necrons,Original Mon-keigh, Eldar, none could rule the galaxy forever. Imperiums never been even close to their level and in an effort to get there it would sooner or later crumble apart. It's just too much to handle.

At the same time those who don't care about such things like the Orks, Jokaero, Kroot are doing just fine.

Moral of the story, don't try and take over the universe, it won't happen and you'll just fall on your face and cry, or end up on a golden toilet, watching as all your meager efforts are flushed down the drain.

Its just a matter of time till mankind is toppled, but we are talking about the Emperors plan for psykers.

**the ancient**

The imperial truth, is just religion in another name.
They had more or less destroyed the ork. There was noone else.
With the time stand still and little influence of khaos in the webway. 10k years of psykers that werent sacrificed to the throne and assorted imperial factions.
Could well be a army to conquer the stars.
Its not like the emp doesnt have form for wiping out what isnt needed. Hed throw half to 4/5ths of the race under the bus, if he thought it necessary for survival.

**Telemake**

Like CarlovonsexronMade, I think the Emperor's plan had to do with eugenism : by eliminating nearly every pysker found, the Imperium purge the weak minded, the undisciplined, the dumb and the corrupt. The smarter ones, which success in control their own powers enough to keep under the radar are the only ones who can have descendants, biologicaly speaking or by teaching. Eliminating the Chaos pressure by starving it and selecting strong bloodlines can be done both.

Sure, there are sanctioned psyker. They are selected, trained ... "formated". A very calibrated gene pool can cause a lot of problem (lack of adaptablity, genetic disorders etc.) but forced evolution using pressure can give interesting results, not always predictible, for the best or the worst.

**Formosa**

the ancient wrote:
The imperial truth, is just religion in another name.
They had more or less destroyed the ork. There was noone else.
With the time stand still and little influence of khaos in the webway. 10k years of psykers that werent sacrificed to the throne and assorted imperial factions.
Could well be a army to conquer the stars.
Its not like the emp doesnt have form for wiping out what isnt needed. Hed throw half to 4/5ths of the race under the bus, if he thought it necessary for survival.

The Orks came back with a vengeance in beast arises, even with the legions and primarhs and the emperor the imperium would have been hard pressed to fend the off

**Mellow**

Well in TBA Imperial and Traitor forces worked together to fight the Orks. In reality the Tyranids are the biggest threat. If they win all life is finished and then Chaos has nothing to work with either due to the Hive mind. Literally no one wins if the Tyranids win.

**Delvarus Centurion**

Mellow wrote:
Well in TBA Imperial and Traitor forces worked together to fight the Orks. In reality the Tyranids are the biggest threat. If they win all life is finished and then Chaos has nothing to work with either due to the Hive mind. Literally no one wins if the Tyranids win.

Thing is we don't know whether the Tyranids that are already here are just the spear-tip, or all that there is.

**Formosa**

Delvarus Centurion wrote:
Mellow wrote:
Well in TBA Imperial and Traitor forces worked together to fight the Orks. In reality the Tyranids are the biggest threat. If they win all life is finished and then Chaos has nothing to work with either due to the Hive mind. Literally no one wins if the Tyranids win.

Thing is we don't know whether the Tyranids that are already here are just the spear-tip, or all that there is.

And we also know chaos infests other dimensions so killing all humans in this one would likely just move them on elsewhere.

It’s led to my pet theory that the chaos gods didn’t actually originate in “our” universe but just came to it and that the big 4 are just eternal aspects of the multiverse, kind of like in AOS where they destroy and that ... world dragon I think it was called, creates universes, it’s hard to describe but kind of like they are parts of the greater “gods” aspects of their power within the warp but not the greater being itself, or greater concept would be a better description, so any reality that has sentient life will eventually have them turn up, they may not have the exact same names, or function in the exact same manner, but they are part of the same entity, enough rambling from me.

I used to have a whole folder of references of chaos being multidimensional beings, I’ll see if I still have it.

**Bharring**

"Literally no one wins if the Tyranids win."
Craftworlders win. No longer devoured by Slanesh!

One of my Farseers started a cult thinking that way...

**Delvarus Centurion**

Formosa wrote:
Delvarus Centurion wrote:
Mellow wrote:
Well in TBA Imperial and Traitor forces worked together to fight the Orks. In reality the Tyranids are the biggest threat. If they win all life is finished and then Chaos has nothing to work with either due to the Hive mind. Literally no one wins if the Tyranids win.

Thing is we don't know whether the Tyranids that are already here are just the spear-tip, or all that there is.

And we also know chaos infests other dimensions so killing all humans in this one would likely just move them on elsewhere.

It’s led to my pet theory that the chaos gods didn’t actually originate in “our” universe but just came to it and that the big 4 are just eternal aspects of the multiverse, kind of like in AOS where they destroy and that ... world dragon I think it was called, creates universes, it’s hard to describe but kind of like they are parts of the greater “gods” aspects of their power within the warp but not the greater being itself, or greater concept would be a better description, so any reality that has sentient life will eventually have them turn up, they may not have the exact same names, or function in the exact same manner, but they are part of the same entity, enough rambling from me.

I used to have a whole folder of references of chaos being multidimensional beings, I’ll see if I still have it.

Totally agree, because Slaanesh existed before he/she's birth, so there might be another dimension other than the materium and the immaterium or they exist in the warp as an essence before they are strong enough to be born.

**Mellow**

I always believed Slaanesh existed before it was born because in the Warp time literally has no meaning. So whilst it had a birth in real space as shown by the eye of terror opening in the Warp it has always been there.

Some theories are far too complex but I prefer the simpler ones that may or may not have a little twist. Not everything has to be an alpha Legion plot.

**Delvarus Centurion**

Mellow wrote:
I always believed Slaanesh existed before it was born because in the Warp time literally has no meaning. So whilst it had a birth in real space as shown by the eye of terror opening in the Warp it has always been there.

Some theories are far too complex but I prefer the simpler ones that may or may not have a little twist. Not everything has to be an alpha Legion plot.

Well pleasure always existed, but the earlier the civilisation the more toil and less pleasure etc. So it wasn't strong enough to exist on the same level as the other gods as war, entropy and knowledge existed on a high level since the beginning. I think mankind's zenith and the Eldars zenith created enough pleasure, for Slaanesh to be born, so it kinda makes sense that Slaanesh would be born after the other gods. Come to think of it, Slaanesh must be getting weaker with the eternal war, so much more anguish than pleasure these 40k days.

**pm713**

Delvarus Centurion wrote:
Mellow wrote:
I always believed Slaanesh existed before it was born because in the Warp time literally has no meaning. So whilst it had a birth in real space as shown by the eye of terror opening in the Warp it has always been there.

Some theories are far too complex but I prefer the simpler ones that may or may not have a little twist. Not everything has to be an alpha Legion plot.

Well pleasure always existed, but the earlier the civilisation the more toil and less pleasure etc. So it wasn't strong enough to exist on the same level as the other gods as war, entropy and knowledge existed on a high level since the beginning. I think mankind's zenith and the Eldars zenith created enough pleasure, for Slaanesh to be born, so it kinda makes sense that Slaanesh would be born after the other gods. Come to think of it, Slaanesh must be getting weaker with the eternal war, so much more anguish than pleasure these 40k days.

Slaanesh benefits from war as much as anyone. It's all about desire and excess rather than plain pleasure. The 40k community seems very into that misconception.

**Formosa**

Yep slaanesh is all forms of excess, you are just as likely to get a monstrously obese cannibal follower of slaanesh bedecked in baroque power armour that is barely able to hold in its bulk, as a lithe Deviant obsessed with its next high, games workshop, much like tzeench, has never been able to nail down slaaneshs theme properly, funny considering they came up with shim.

**Delvarus Centurion**

pm713 wrote:
Delvarus Centurion wrote:
Mellow wrote:
I always believed Slaanesh existed before it was born because in the Warp time literally has no meaning. So whilst it had a birth in real space as shown by the eye of terror opening in the Warp it has always been there.

Some theories are far too complex but I prefer the simpler ones that may or may not have a little twist. Not everything has to be an alpha Legion plot.

Well pleasure always existed, but the earlier the civilisation the more toil and less pleasure etc. So it wasn't strong enough to exist on the same level as the other gods as war, entropy and knowledge existed on a high level since the beginning. I think mankind's zenith and the Eldars zenith created enough pleasure, for Slaanesh to be born, so it kinda makes sense that Slaanesh would be born after the other gods. Come to think of it, Slaanesh must be getting weaker with the eternal war, so much more anguish than pleasure these 40k days.

Slaanesh benefits from war as much as anyone. It's all about desire and excess rather than plain pleasure. The 40k community seems very into that misconception.

Slaanesh would have been born earlier if that was the case. Slaanesh may benefit from war but obviously not to the same degree it seems. War is mostly flight or fight responses, there are less chances to savour the kill, maybe that's why.

**pm713**

Delvarus Centurion wrote:
pm713 wrote:
Delvarus Centurion wrote:
Mellow wrote:
I always believed Slaanesh existed before it was born because in the Warp time literally has no meaning. So whilst it had a birth in real space as shown by the eye of terror opening in the Warp it has always been there.

Some theories are far too complex but I prefer the simpler ones that may or may not have a little twist. Not everything has to be an alpha Legion plot.

Well pleasure always existed, but the earlier the civilisation the more toil and less pleasure etc. So it wasn't strong enough to exist on the same level as the other gods as war, entropy and knowledge existed on a high level since the beginning. I think mankind's zenith and the Eldars zenith created enough pleasure, for Slaanesh to be born, so it kinda makes sense that Slaanesh would be born after the other gods. Come to think of it, Slaanesh must be getting weaker with the eternal war, so much more anguish than pleasure these 40k days.

Slaanesh benefits from war as much as anyone. It's all about desire and excess rather than plain pleasure. The 40k community seems very into that misconception.

Slaanesh would have been born earlier if that was the case. Slaanesh may benefit from war but obviously not to the same degree it seems. War is mostly flight or fight responses, there are less chances to savour the kill, maybe that's why.

No it wouldn't. You seem to have a fundamental misunderstanding of Slaanesh's role in 40k. War is full of desire; the desire to win, the desire to survive, the desire to kill the enemy and there's a lot of chance for excess to develop as well.

**Formosa**

As someone who fires guns for a living, I can see the appeal of noise marines... and Orks.

**Delvarus Centurion**

pm713 wrote:
Delvarus Centurion wrote:
pm713 wrote:
Delvarus Centurion wrote:
Mellow wrote:
I always believed Slaanesh existed before it was born because in the Warp time literally has no meaning. So whilst it had a birth in real space as shown by the eye of terror opening in the Warp it has always been there.

Some theories are far too complex but I prefer the simpler ones that may or may not have a little twist. Not everything has to be an alpha Legion plot.

Well pleasure always existed, but the earlier the civilisation the more toil and less pleasure etc. So it wasn't strong enough to exist on the same level as the other gods as war, entropy and knowledge existed on a high level since the beginning. I think mankind's zenith and the Eldars zenith created enough pleasure, for Slaanesh to be born, so it kinda makes sense that Slaanesh would be born after the other gods. Come to think of it, Slaanesh must be getting weaker with the eternal war, so much more anguish than pleasure these 40k days.

Slaanesh benefits from war as much as anyone. It's all about desire and excess rather than plain pleasure. The 40k community seems very into that misconception.

Slaanesh would have been born earlier if that was the case. Slaanesh may benefit from war but obviously not to the same degree it seems. War is mostly flight or fight responses, there are less chances to savour the kill, maybe that's why.

No it wouldn't. You seem to have a fundamental misunderstanding of Slaanesh's role in 40k. War is full of desire; the desire to win, the desire to survive, the desire to kill the enemy and there's a lot of chance for excess to develop as well.

Again, why did Slaanesh not arise at the same time as the other gods, Slaanesh obviously doesn't get the same amount of sustenance from war, and since it was the Eldar that brought Slaanesh into being it had far more to do with hedonism than war. We are talking about conjecture which, nearly everything is when talking about the nature of the gods, I'm not gonna play who's right and wrong with you, I can't be bothered.

**Formosa**

Delvarus Centurion wrote:
pm713 wrote:
Delvarus Centurion wrote:
pm713 wrote:
Delvarus Centurion wrote:
Mellow wrote:
I always believed Slaanesh existed before it was born because in the Warp time literally has no meaning. So whilst it had a birth in real space as shown by the eye of terror opening in the Warp it has always been there.

Some theories are far too complex but I prefer the simpler ones that may or may not have a little twist. Not everything has to be an alpha Legion plot.

Well pleasure always existed, but the earlier the civilisation the more toil and less pleasure etc. So it wasn't strong enough to exist on the same level as the other gods as war, entropy and knowledge existed on a high level since the beginning. I think mankind's zenith and the Eldars zenith created enough pleasure, for Slaanesh to be born, so it kinda makes sense that Slaanesh would be born after the other gods. Come to think of it, Slaanesh must be getting weaker with the eternal war, so much more anguish than pleasure these 40k days.

Slaanesh benefits from war as much as anyone. It's all about desire and excess rather than plain pleasure. The 40k community seems very into that misconception.

Slaanesh would have been born earlier if that was the case. Slaanesh may benefit from war but obviously not to the same degree it seems. War is mostly flight or fight responses, there are less chances to savour the kill, maybe that's why.

No it wouldn't. You seem to have a fundamental misunderstanding of Slaanesh's role in 40k. War is full of desire; the desire to win, the desire to survive, the desire to kill the enemy and there's a lot of chance for excess to develop as well.

Again, why did Slaanesh not arise at the same time as the other gods, Slaanesh obviously doesn't get the same amount of sustenance from war, and since it was the Eldar that brought Slaanesh into being it had far more to do with hedonism than war. We are talking about conjecture which, nearly everything is when talking about the nature of the gods, I'm not gonna play who's right and wrong with you, I can't be bothered.

How much were the eldar fighting prior to the fall, maybe it’s just a matter of degrees, plus all of the gods have overlap, nurgle fundamentally changes everything it infects, bringing life from death, people pray to nurgle to cure thier deseases in the hope it will work, change and hope is tzeenchs thing too, a human might resign itself to despair and charge an enemy unit killing several in a bloody melee and finally dying, despair and blood letting, that’s khorne and nurgle, I could go on but I think it get the point.

**Delvarus Centurion**

Formosa wrote:
Delvarus Centurion wrote:
pm713 wrote:
Delvarus Centurion wrote:
pm713 wrote:
Delvarus Centurion wrote:
Mellow wrote:
I always believed Slaanesh existed before it was born because in the Warp time literally has no meaning. So whilst it had a birth in real space as shown by the eye of terror opening in the Warp it has always been there.

Some theories are far too complex but I prefer the simpler ones that may or may not have a little twist. Not everything has to be an alpha Legion plot.

Well pleasure always existed, but the earlier the civilisation the more toil and less pleasure etc. So it wasn't strong enough to exist on the same level as the other gods as war, entropy and knowledge existed on a high level since the beginning. I think mankind's zenith and the Eldars zenith created enough pleasure, for Slaanesh to be born, so it kinda makes sense that Slaanesh would be born after the other gods. Come to think of it, Slaanesh must be getting weaker with the eternal war, so much more anguish than pleasure these 40k days.

Slaanesh benefits from war as much as anyone. It's all about desire and excess rather than plain pleasure. The 40k community seems very into that misconception.

Slaanesh would have been born earlier if that was the case. Slaanesh may benefit from war but obviously not to the same degree it seems. War is mostly flight or fight responses, there are less chances to savour the kill, maybe that's why.

No it wouldn't. You seem to have a fundamental misunderstanding of Slaanesh's role in 40k. War is full of desire; the desire to win, the desire to survive, the desire to kill the enemy and there's a lot of chance for excess to develop as well.

Again, why did Slaanesh not arise at the same time as the other gods, Slaanesh obviously doesn't get the same amount of sustenance from war, and since it was the Eldar that brought Slaanesh into being it had far more to do with hedonism than war. We are talking about conjecture which, nearly everything is when talking about the nature of the gods, I'm not gonna play who's right and wrong with you, I can't be bothered.

How much were the eldar fighting prior to the fall, maybe it’s just a matter of degrees, plus all of the gods have overlap, nurgle fundamentally changes everything it infects, bringing life from death, people pray to nurgle to cure thier deseases in the hope it will work, change and hope is tzeenchs thing too, a human might resign itself to despair and charge an enemy unit killing several in a bloody melee and finally dying, despair and blood letting, that’s khorne and nurgle, I could go on but I think it get the point.

I know they were a lot of gladiator fights for entertainment, though I haven't heard anything about them fighting in actual wars. They overlap but they must get the majority of the strength from their particular characteristics, utherwise they'd pretty much be equal in a lot of respects, like nurgle might share in the deaths of war, but I could imagine he gets more strength from dying of age or illness etc.

**Formosa**

The gods “fighting” could literally be them trying to gain total control of the overlapping concepts/emotions, so our minds would interpret that as Deamons fighting for the great game.

That’s the biggest problem with chaos, it’s as much concept as it is tangible creatures, khorne is a massive vortex in the warp, completely without shape or structure, at the same time khorne is a great beast that sits atop a throne of skulls overlooking its domain, it’s both and neither.... CHAOS!

**Delvarus Centurion**

Formosa wrote:
The gods “fighting” could literally be them trying to gain total control of the overlapping concepts/emotions, so our minds would interpret that as Deamons fighting for the great game.

That’s the biggest problem with chaos, it’s as much concept as it is tangible creatures, khorne is a massive vortex in the warp, completely without shape or structure, at the same time khorne is a great beast that sits atop a throne of skulls overlooking its domain, it’s both and neither.... CHAOS!

Yeah but the only way we can even begin to understand them is down to our own intuitive understanding. It fun to theorise, but there are very little concrete facts you can come to the conclusion of and even at that, you're right as Daemons lie and there nature always change.

**Grey Templar**

Andykp wrote:
Grey Templar wrote:
I think the general idea was something like this.

Goal: A future where all of mankind is psychic and lives in peace, having dominated the entire universe.

Main Obstacle: Chaos entities feed on the emotions of sentient beings, and inhabit/control the Warp which is the source of psychic power.

So you have to cleanse the warp of these evil entities. The solution the Emperor came up with was to starve them by ridding humanity of all religion, superstition, and a general reduction of emotions. While also exterminating the Xenos, both because they too could feed Chaos and because they are also threat to humanity. The suppression of Psykers was also important here because, while the Emperor's ultimate goal for humanity, they were also an obstacle to ridding the Warp of Chaos because of their direct link to it. They could reveal the existence of Chaos and thereby keep the plan from working.

Then, once the Warp was starved and the 4 Great Powers dwindled, the Emperor could slowly bring about his psyker eugenics plan.

The only reason the plan failed was because the Emperor played his cards too close to his chest and didn't share the plan with the Primarchs. If they had known about Chaos upfront, it is unlikely that any of them would have been corrupted. The daemons couldn't have used the Emperor's distrust of his sons as a wedge to drive between them.

I agree with up until the end, I have to say I think the primarchs would’ve been tempted into turning if they had known about chaos. I still believe, like in the other thread that ignorance is a defence, if they had known they would’ve had to have a look. And the gods would’ve got their claws in one way or another. They were all to messed up with daddy issues not to tempted at some point. Unless the emperor had done other things differently too.

Possibly, but if they had known it is unlikely that half of them would have turned. Reading the Horus Heresy, it really came down to only a few snap decisions. Most of which relied on hurt feelings of being left out of the loop, deceived, etc... If the Primarch's had known about Chaos and what a threat it was they would have been distrustful of any attempts to woo them. Instead, they were unprepared when the tempting daemons came because, after all, the Daemon's existence was proof of the Emperor lying to them. If they had known, they would have been like "Oh, Dad told me about you guys." *fires bolter

**Andykp**

Grey Templar wrote:
Andykp wrote:
Grey Templar wrote:
I think the general idea was something like this.

Goal: A future where all of mankind is psychic and lives in peace, having dominated the entire universe.

Main Obstacle: Chaos entities feed on the emotions of sentient beings, and inhabit/control the Warp which is the source of psychic power.

So you have to cleanse the warp of these evil entities. The solution the Emperor came up with was to starve them by ridding humanity of all religion, superstition, and a general reduction of emotions. While also exterminating the Xenos, both because they too could feed Chaos and because they are also threat to humanity. The suppression of Psykers was also important here because, while the Emperor's ultimate goal for humanity, they were also an obstacle to ridding the Warp of Chaos because of their direct link to it. They could reveal the existence of Chaos and thereby keep the plan from working.

Then, once the Warp was starved and the 4 Great Powers dwindled, the Emperor could slowly bring about his psyker eugenics plan.

The only reason the plan failed was because the Emperor played his cards too close to his chest and didn't share the plan with the Primarchs. If they had known about Chaos upfront, it is unlikely that any of them would have been corrupted. The daemons couldn't have used the Emperor's distrust of his sons as a wedge to drive between them.

I agree with up until the end, I have to say I think the primarchs would’ve been tempted into turning if they had known about chaos. I still believe, like in the other thread that ignorance is a defence, if they had known they would’ve had to have a look. And the gods would’ve got their claws in one way or another. They were all to messed up with daddy issues not to tempted at some point. Unless the emperor had done other things differently too.

Possibly, but if they had known it is unlikely that half of them would have turned. Reading the Horus Heresy, it really came down to only a few snap decisions. Most of which relied on hurt feelings of being left out of the loop, deceived, etc... If the Primarch's had known about Chaos and what a threat it was they would have been distrustful of any attempts to woo them. Instead, they were unprepared when the tempting daemons came because, after all, the Daemon's existence was proof of the Emperor lying to them. If they had known, they would have been like "Oh, Dad told me about you guys." *fires bolter

Good point. I think some would’ve turned but maybe different ones in different ways. The primarchs all had such character flaws that chaos could still have gotten their claws in. It would definitely changed the whole nature of the heresey. Maybe it would’ve been smaller like you say. The emperor was still a dick to them all.