Suicide

But then, was it intended to keep it hidden from universes? It did make a little sense, since one universe had noticed them and even sent someone so powerful to conquer it; then it was possible that in the future more universes would notice them and send even more dangerous foes to capture the universe.

So, creating that barrier not only provided a defensive shield but also kept the entire universe hidden; that's why no other universe had managed to find it yet.

Despite that, Jayden felt that this still wasn't a sufficient reason for the world devourer to sacrifice his own life— at some point, the barrier would be useless, and then what?

The world devourer died only to be reborn. Even if Jayden's strength grew and rivaled that of the world devourer, won't the situation still be the same? Was he too just supposed to sacrifice his life and continue with the same cycle, creating a new barrier that would keep the universe protected for a long time?