Editing Skein of Worlds:Cosmology and Setting (section)

=== The Elemental Tempest ===
The third of the great orbs leads to the Elemental Tempest, the source of all four elements. This place exists as a foam, with each bubble containing a different mix of elements. These bubbles are larger the closer you are to the Astral Plane. Some are large enough to hold entire civilizations. The bubbles aren't entirely stable though. Fortunately, for those living there, the older and larger a bubble is, the less likely it is to change, at least nearer to the center.