Any space, any zone, any void had to be protected by a spatial barrier so that the open space would not swallow and destroy it. It was the basis for the voids themselves to exist as well as the creatures within them, like shells and reefs amidst a vast ocean of darkness.
However, this did not mean that the mere appearance of open space and its darkness could destroy any void. After all, the World of Darkness was not evil or good, it was an opportunity for other entities to exist, to be inhabited by living beings.
Beastfolk World and the worlds of the other Pillars were no exceptions, however, it was obvious that these worlds were the largest and strongest comparable to which only Arkan World and Dragon World could compare, nothing more.