Open Sky

Open Sky is the common name for the vast expanse between island chains. Other names include the Midnight Ocean or the Ever-Night, so named due to the lack of sources of light other than the moon and it's cascade of stars.

Naturalists are always perplexed by the strange spores that blow up from the open sky. The pervailing theory is that they propagate from doldrums. The spores are a common sight on the bottom of ships, growing into complex coral like constructs out of fungus. Some ship captains allow the growths for they attract flying creatures who seek shelter which can be caught and eaten. Other captains are quick to eliminate any growths lest they unbalance the ship.

What few people realize is that the spores blow up from the abyss. Down at the farthest deepest layer of the abyss grows a massive mat of vegetation. Fungus and slime molds that feed on every scrap of detritus that falls from the world above, and feeds on the god's blood that bleeds into the void. In a way it forms a scab over the true edge of reality.

The spores typically find root on the underside of islands. Growing into large moist hanging jungles of fungus. Slime molds breed rapidly in the fungus jungles, eventually growing into a long rope hanging from the lowest point of the island.

The true danger is from it's sister growing up from the abyss. Should the two colonies meet the island will be pulled into the abyss and lost like many ancient civilizations.

To Add:

 * Storms from above
 * Above the plane the sky continues on. Where the Abyss reality thins, in the Deep sky reality is compressed, time and space folding upon itself. Great storms are constant in the Deep Sky.
 * Storms blow down from the Deep, they carry with them Sky Falls which are falling islands, commonly a source of new minerals in the broken worlds.
 * High in the Deep Sky the storms buffet and blow ships around, no telling where they might end up. If they're lucky they're be within travel distance of their homeland. The Deep Sky acts as a wormhole where space folds over and can randomly deposit the ship anywhere.