system
Given the following post, respond as if you're commenting on Reddit:
human
[Warhammer 40k] How do Chaos Space Marines keep their numbers up?

We know Adeptus Astartes recruit regular humans and enhance them. This allows them to replace combat casualties and other fallen Space Marines. However, How do the Chaos Space Marines replace casualties? I know that some Adeptus Astartes ~~see the true ways~~ fall to Chaos from time to time, and even sometimes entire chapters. However, I guess the rate at which new Marines fall to Chaos is much slower than the rate at which Chaos Space Marines fall in battle.

What do CSM do? Do they revive fallen Marine through some demonic power? Do they have some process to enhance regular humans who worship Chaos to the level of a Space Marine, so they can kind of recruit at least?
gpt
There are a few methods:

* stealing geneseed from loyalists
* daemoncubla (I probably spelled that wrong)
* 'undeath' through warp powers

Overall, this is the CSM's biggest logistical problem and one they constantly fight over.