The New World

Everyone who reached at least the First Chronicle could create their own void if they passed a test before doing so. However, this was only possible because of the nearly infinite energy of the World of Darkness, as it took energy to create barriers, spatial zones, elements, and territories. 

The Void Owners just maintained and increased their zones by infusing them with their soul energy, but without the World of Darkness, this would have been impossible, or rather practically impossible.

Nameless King was the first to reach the Transcendence Stage, which meant he was even higher than the gods. Those on the God Stage were highly dependent on the faith of their followers, while the Nameless King and the Progenitors of Races were completely independent. 

Their power depended only on them, as well as energy, so the energy from Nameless King's Soul could survive in empty space, it was the only exception to the rule.

Tremble. Tremble. Tremble.