Promyvion is an otherworldly region in Final Fantasy XI. It is the product of the Emptiness that chews at the lands and inhabitants of Vana'diel. It surrounds four of the five mothercrystals, the massive stones that project life into the world. Chunks of terrain and fragments of partially-digested buildings float hopelessly through its darkness. Memories of departed souls that wander into these forsaken plains transform into the monstrous Empty. The fifth mothercrystal is subject to a distinct but similar manifestation of Emptiness called Apollyon.