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So you are a loyalist marine captain (chapter of your choosing). You have the knowledge and hindsight of every event that has occured upto the current timeline. You can make one time jump to influence history (forget the whole logic of changing history means you cease to exist so therefore couldn't have made the time jump in the first place).
When you arrive, you have no time to explain anything to anybody but must jump straight into action. So no going to Calth ahead of the Word Bearers and making the Ultramarines ready for the coming attack.
The there are three systems inaccessible to your time travel device. The Sol system the Davin system and the system of the homeworld of the Interex.
Where would 100 marines with the knowledge of hindsight make a massive difference to the timeline that will benefit the Imperium?
Where and when would you go?

Jump back to the fight between Horus and the Emperor. Wreck Horus'

And I realised I can't go to the Sol system... because arbitrary nonsense...

No jumping to the Sol system.


Automatically Appended Next Post:

 Tactical_Spam wrote:
Jump back to the fight between Horus and the Emperor. Wreck Horus'

And I realised I can't go to the Sol system... because arbitrary nonsense...

Reason I put that in was because the 3 or 4 obvious answers are: fight between Sanguinius-Horus/Emperor-Horus, Conversion of Horus or Erebus' theft of the weapon that will convert Horus.

We all know those will be the most effective times to travel to. So when else will be a time where 100 marines greatly change the timeline?

I would stop the creation of Men of Iron -> Dark Age of Technology would propably never end/end later -> Heresy Might not happend at all -> Technological superiority -> Imperium Wins

Step 1: Move a planet out of its orbit, some time reeeaaaally long ago

Step 2: Have it hit Terra just before the HH reaches Terra, but while Mr E is still there.

Step 3: Emprah Horus.

But that's me.

As a loyalist, have it hit Horus at some point.

Second option, Kill Kor Phaeron and Erebus before they convert Lorgar, or stop Magnus from psychic telephoning Big E

Kill hitler... ehm sorry kill the emperor before he was born.
He is an abomination and his empire is a shadow of what humanity could be.

If I was loyal to the empire then I would have taken 100 relictors and have rescued Adept Zeth, Dalia Cythera and the unfinished Akashic Reader and shipped it to my cruiser before the hell broke loose on mars.
This could even explain why no one has seen the relictors any more.

Jump to 2008 and punch Matt Ward in the face 100 times with 100 marines.

 Tactical_Spam wrote:
Second option, Kill Kor Phaeron and Erebus before they convert Lorgar, or stop Magnus from psychic telephoning Big E

Killing those two seems to be the best option, but who knows if the chaos gods had a back-up plan (they most certainly had, but well). Another big problem is also the "time travel as a vision that occured for Argel Tal and the Seated Sun Chapter (and also Horus IIRC) which f*cked everything up. If we kill Erebus It could create an infinite time paradox, since Argel Tal would never have split the primarchs accross the galaxy, and therefore Lorgar would never have ended on colchis, and therefore² wouldn't have led to Erebus becoming what he was, and thus make it impossible to kill him with our initial time travel.

Engrenages wrote:

 Tactical_Spam wrote:
Second option, Kill Kor Phaeron and Erebus before they convert Lorgar, or stop Magnus from psychic telephoning Big E

Killing those two seems to be the best option, but who knows if the chaos gods had a back-up plan (they most certainly had, but well). Another big problem is also the "time travel as a vision that occured for Argel Tal and the Seated Sun Chapter (and also Horus IIRC) which f*cked everything up. If we kill Erebus It could create an infinite time paradox, since Argel Tal would never have split the primarchs accross the galaxy, and therefore Lorgar would never have ended on colchis, and therefore² wouldn't have led to Erebus becoming what he was, and thus make it impossible to kill him with our initial time travel.

What? We kill Phaeron and Erebus and Argel Tal doesn't go back in time?

Go to the Laer Worlds and remove the sword so it can never corrupt Fulgrim. Fulgrim and the Emperor's Children remain loyal, the twin Isstvan battles are not nearly as devastating, Ferrus Manus doesn't die, the Eldar may establish diplomatic contact with the Imperium courtesy of Fulgrim, and because Fulgrim doesn't become a Daemon Prince, Guilliman doesn't die either.

 Wyzilla wrote:
Go to the Laer Worlds and remove the sword so it can never corrupt Fulgrim. Fulgrim and the Emperor's Children remain loyal, the twin Isstvan battles are not nearly as devastating, Ferrus Manus doesn't die, the Eldar may establish diplomatic contact with the Imperium courtesy of Fulgrim, and because Fulgrim doesn't become a Daemon Prince, Guilliman doesn't die either.

I was trying to come up with a way to change Istaavan and this works better than what I had.

There's always a chance Slaanesh would come up with an alternate way to corrupt Fulgrim.

TiamatRoar wrote:
There's always a chance Slaanesh would come up with an alternate way to corrupt Fulgrim.

Assuming the butterfly effect, no he, she, it wouldn't have a different plan.

Assuming the "Time corrects itself" theory, Slaanesh would still corrupt him.

Mantis Warriors.

Gorro.

Assassinate Horus while he's watching the Emperor bloodline-purge the Ork Prophet.

What if you removed the very first eldar pleasure cult

By this way slaanesh may never exist?

Humanity may have a changed future but no reign of chaos?

 Furyou Miko wrote:
Mantis Warriors.

Gorro.

Assassinate Horus while he's watching the Emperor bloodline-purge the Ork Prophet.

Horus really is the linchpin here. The Chaos gods would inevitably develop additional plans after the loss of people like Erebus or Kor Phaeron, but Horus is the only one I can see being able to put the Emperor in his corpse-state. I just don't see the Emperor holding back as much against the other primarchs like he did against Horus. So even if the heresy still happens in some form or another, if the Emperor is still walking around afterwards then it is a net win for the Imperium.

 jhe90 wrote:
What if you removed the very first eldar pleasure cult

By this way slaanesh may never exist?

Humanity may have a changed future but no reign of chaos?

Considering the Eldar Pleasure cults were started by a Greater Daemon of Slaanesh, good fething luck with a Company of Marines.

 Wyzilla wrote:

 jhe90 wrote:
What if you removed the very first eldar pleasure cult

By this way slaanesh may never exist?

Humanity may have a changed future but no reign of chaos?

Considering the Eldar Pleasure cults were started by a Greater Daemon of Slaanesh, good fething luck with a Company of Marines.

No saying I cannot bring the grey knights, there a chapter

Hm. Take them on a coach trip to 1970s Blackpool pleasure beach and promenade, and enjoy the seaside. We'd have to argue to get them on some of the height restricted rides.
Take them in the ballroom after, and maybe see a show.

Tell me they don't deserve it.

So you can travel back in time but not in time to get in a quick conversation to let people know what the hell is going on?

I would go back to the start of the golden age of mankind, to one of the core human worlds and lay out to the locals the world of poop that is going to go down and hope to change things

 jhe90 wrote:

 Wyzilla wrote:

 jhe90 wrote:
What if you removed the very first eldar pleasure cult

By this way slaanesh may never exist?

Humanity may have a changed future but no reign of chaos?

Considering the Eldar Pleasure cults were started by a Greater Daemon of Slaanesh, good fething luck with a Company of Marines.

No saying I cannot bring the grey knights, there a chapter

Too bad you can't bring Kaldor Draigo

 Tactical_Spam wrote:


Too bad you can't bring Kaldor Draigo

Don't worry - he'll show up anyway.

 Furyou Miko wrote:

 Tactical_Spam wrote:


Too bad you can't bring Kaldor Draigo

Don't worry - he'll show up anyway.

The possibility of that happening is high.

Destroy Erebus and Kor and Colchis

Edit: Pre heresy/Pre Emperor's arrival to the planet

Cthonia

Shoot baby Horus in the face.

 MechaEmperor7000 wrote:
Jump to 2008 and punch Matt Ward in the face 100 times with 100 marines.

I like this. I would use Iron Hands to do it.

Or maybe take the Space Wolves back to the Vikings game today and replace the Vikings players with the Space Wolves.

If I have to keep it in the world of 40k I'd say take the Iron Hands led by a Iron Council back to prevent the death of Ferrus. That was one of the most disgraceful, pathetic death's ever. Or maybe just make sure Kardan Stronos is aborted as a baby.

My top picks for what to do with them:

Have the 100 marines wipe out the Cabal reaching out to the Alpha Legion to prevent them from fragmenting into all the various factions that occur in the Heresy (or at least have them ostensibly stay on the loyalist side).

Have the 100 marines stop Lorgar's attempt to commune with the Chaos Gods when he's on Cadia, backing up the lone Custode that accompanies them on the surface and either taking Lorgar out or at the very least hindering the ritual (presuming I'm taking Grey Knights here).

 Grimskul wrote:
My top picks for what to do with them:

Have the 100 marines wipe out the Cabal reaching out to the Alpha Legion to prevent them from fragmenting into all the various factions that occur in the Heresy (or at least have them ostensibly stay on the loyalist side).

Have the 100 marines stop Lorgar's attempt to commune with the Chaos Gods when he's on Cadia, backing up the lone Custode that accompanies them on the surface and either taking Lorgar out or at the very least hindering the ritual (presuming I'm taking Grey Knights here).

Why would you take anything else but grey knights?

 Tactical_Spam wrote:

 Grimskul wrote:
My top picks for what to do with them:

Have the 100 marines wipe out the Cabal reaching out to the Alpha Legion to prevent them from fragmenting into all the various factions that occur in the Heresy (or at least have them ostensibly stay on the loyalist side).

Have the 100 marines stop Lorgar's attempt to commune with the Chaos Gods when he's on Cadia, backing up the lone Custode that accompanies them on the surface and either taking Lorgar out or at the very least hindering the ritual (presuming I'm taking Grey Knights here).

Why would you take anything else but grey knights?

Yeah, hard to figure out why you wouldn't in most cases, short of you trying to do something directly against the sisters of silence I can't see any other chapter outmatching them.