Symbiofortress Rustballs

The symbiofortress rustballs split from their ancestors and took to life with the symbiofortress. It grows around the edges of each symbiofortress diamiboard, and will absorb iron oxide from within the sand should it be plentiful. They use this iron oxide to strengthen their internal structures and prevent water loss. In areas with little to no iron oxide in the sand, the symbiofortress rustballs have a pinkish coloration and rely primarily on photosynthesis.

The rustballs store excess nutrients and such, created from photosynthesis, and supply them to the diamiboard which in turn supplies them with excess water. Both species benefit from the relationship, especially since the symbiofortress rustballs can provide secure areas where symbiofortress diamiboard spores can grow.