Hollow Cryodome

The 'hollow cryodome has split from its ancestor, the cryodome, moving into the Sublyme Limestone Caves. Their, it formed a symbiotic relationship with the hydroutine, growing it in its sponge-like interior, giving it water in return for part of its energy that it produced from hydrogen. Eventually, the center grew into a hollow, specialized chamber for growing the hydroutine. Over time, the hollow cryodome has become entirely reliant on the microorganisms for energy, except for the few lucky enough to live near the entrance of the caves, which still use photosynthesis as a supplement to their new lithotrophic diet.

In addition to growing buds that form plants next to them, they now release “seeds” which are basically spherical versions of adults. The hollow center is filled with air and dormant hydroutine. When the seed stops rolling, it will grow roots, elongate, and fill its center with water. Hollow cryodomes also manage to live in air pockets in Drake Water Table, as their hollow seeds float on the water, bumping into the walls of the water table. This has also caused the hydroutine to spread to the water table, where they now thrive.