"You didn't account for what would happen with your Doom Factor 2 if you stayed in the great void for too long, did you?"
Future Skullius had told Skullius that – as a favour – VOW had made it so that he (Skullius) could delay the effects of the Doom Factors by inhabiting a world with a slower flow of time.
Consternals were the standard form for the flow of events in the wider reality, a grander scale of time. Each world, depending on powerful it was, had a flow of time lesser or equal to the standard flow of events in the wider reality. The latter was only true for worlds created by the Primeval Deities.
Doom Factor 2 had a countdown based on Consternals, but VOW had made it so that it could be offset if Skullius inhabited a world like Aigas, where he had a full seven days before the Doom Factor took him.
But if he remained in the void, this cooldown was even shorter.