There are 30 knights of Kittauni Mollusk's posted around the sea.
Habitable is guardian reefs. Areas of the shatterstar that have taken up inhabitance by the Tritons. Each major Guardian Reef has some protector, deity, or animal such as an elemental, Dragon Turtle, or Sea Dragon that calls it home, offering protections to the neighboring reef inhabitants.
Battlezone for the Shatterstar are the Tortle Islands sprinkled throughout the shatterstar sea are the habitable islands that many Tortles call their birthplaces. These islands also make room for various pirates as well as migratory, dangerous creatures as well. Other than Tritons, the Tortles here are usually apprehensive to other visitors - but could be convinced with offerings, food, tales and other fixes.
Inhabitable Zones - Ancient Chasms. Deep below the water on the seabed carved throughout the seafloor are the ancient gateways for the realms of Forgotten Ones. Older, endangered, or extinct species of sea life that've been locked away for generations, carved up by the Sahuagin Followers are they seek their dark masters to give rise & power back to the ancient ways when the sea was far more ravenous.