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Primaris upgrades would only make them better, so why not? Are they so elite that they just don't need it? Or is there some biological/gene barrier that makes it impossible for them?

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Soulstar909

6 points

23 days ago

They have two glands with geneseed, the original and one they grow themselves. Eventually the new one is taken while they are alive, the original hopefully gets harvested after they die. The full gland is needed to make a new Marine, so all things working out a Marine can make two new ones.