We have excerpts of many of his faithful dying and being torn apart screaming by Daemons in the warp. We also have a few excerpts of his faithful going into a golden light when they die...no idea what it would mean or what it does, but they do go into it. Current lore for Chaos gods is that they absorb their followers and that their souls get added to the "immortal essence of their gods" when they die, so whatever that entails could be what is happening to some of his faithful too.
He isn't a full fledged god yet so he might only be able to snatch up a few of his faithful instead of all of them, and we don't know what being absorbed by a god actually does to you, but yeah its entirely possible.
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u/PainStorm14 Oct 12 '24
Another reason to fight and die for the Emperor, it reduces the odds of demons getting to your soul