Why, he already got enough survival things like ingnoring instant death, deamonic aura, extra toughness, better armour and extra wounds. Another thing is that either normal daemons or greater deamons has it.
when a demon prince (and other demons as well i believe) is banished (destroyed, basically) they cannot return from the warp for 1000 years and a day. The time dilation effect that the 13th company probably experienced has nothing to do with this.
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