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pm713 wrote:
That's a pretty sweet thing to just evolve. Does anyone know where Hrud came from? I wouldn't be surprised if the Old Ones made them or something.

from what I can tell they're definitely war in heaven time period, and might've been mutated eldar, this is where I got it from https://1d4chan.org/wiki/Hrud

In the Salamander 40k books:

Wasn't that guy in the Warp or am I remembering wrongly?

 Ynneadwraith wrote:
Specifically Space Wolves, but any examples of what happens when Marines start to get close to the end of their natural lifespan would be very helpful!

If there's no real literature on it, I'd imagine something like a 'sent out on a suicide mission so you can die an honourable death' would be preferable to 'sent of to the fortress-monastery to scare the new recruits with your battle-scars'.

For reference, I'm making a little Vlka Fenryka warband for Inquisimunda centring around a Long Fang that's approaching the end of his natural lifespan and is showing the odd sign of senility (or, at least, those who oppose his agenda like to spread that rumour around whether there's truth in it or not).

Custodes end up as the eyes of the emperor when that happens, they become cctv-spies.

Marines are complicated creatures, human bodies stuffed with superhuman organs and dosed with the greatest drugs the Imperium can make.

So it would make sense to say it really depends. For some the implants never take and they die during initiation, I think those numbers are actually pretty high like 90%.

It would make sense that the process works better for some than for others. So some Marines might expect to live a few centuries, while for others they might live over a millennia or longer with no (or little) loss of ability.

In addition marines can enter hibernation (the novel Rogue Trader had a Heresy era marine spend 10,000 years in hibernation), get bionics or undergo a rejuvenation treatment.

As for duties I can see it varying by chapter:
Support
Fleet captains
Recruitment/instruction
Honorable suicide mission
Honorable euthanasia
Lone wolf missions
Wired into a rhino/land raider/whatever