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>>“Just know that you will not be there forever.” Malcador told the Primarch outright, “You are only ageless, not immortal.”
This sounds hilariously like a threat. That or Malcador is intentionally stoking TalOS concern over his mortality so he is more difficult to kill.
I wonder if he ever really would consider a TalOS Inferior like Cawl did, among any other backup plans.
Is it not written: "Thus sayeth the Machine Lord: 'Back Up Thy Data"