So, only beings with souls can get affected by the Hunger?
If so, Flowey is only as twisted as he is now because of the human souls?
(A year wow)
It is a magical “disease”, so beings with magic are affected, not just those with souls. The more magical potential, the more they can resist it, but in the end, they all fall.
Would the hunger affect normal humans? And what if someone from another universe (Fell Papyrus, for example) entered the Axtale universe, would the fact they're not from that verse make them immune or resistant to it or would they be affected like anyone else?
Anything with magic would fall victim in time, same universe or no. Humans take longer, because the magic of their soul is protected inside their physical form, but with enough time they would, yes.
Are monsters still reproducing at all or is the relationship between monsters only that of predator and prey at this point.
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Monsters are not only incapable of breeding now, due to the corruption of their souls, they don’t care to. The Hunger drives most, if not all, only to feed their endless starvation. Any copulation that occurs is perverse and cruel, and will not yield young.
Obviously, this means there are no longer any children in the Underground, and if they don’t all eat each other or get blown up by the CORE, the race will die out entirely.