Building:Trinity Carapace Fortress

Description
This building appears to be made from the shell of some form of giant arthropod, but is in fact a living creature that has evolved from the Trinity Siren. It serves as a shelter for the Trinity species during times when strong shelter is needed. The carapace that makes up the walls of the building is denser than lead and stronger than steel. There are two openings through which to enter the building, though both are lined with teeth.

Interior
Once inside the building-like creature, it becomes very obvious that it is in fact a creatures. First glance inside you see moving slimy walls of breathing flesh. The building is sectioned into three chambers. The first, where you enter through the left door, is the feeding chamber. Here many tube-like appendages hang down. These excrete a fluid produced by the creature, it is very nutritious and can sustain as many as 200 Sirens for up to a year.

The second chamber, where you enter through the right door, is like a large gymnasium. There are plenty of special growths formed within the creature for the Sirens to use to keep in shape while taking refuge within this creature.

The final chamber branches off both of the chambers and has no openings leading out side. This chamber serves as a sleeping chamber. It is filled with fluid filled sacs that the Sirens sleep in. By sleeping within the fluid, they are cusioned from any shock waves or anything else that would disturb the creature.

The Creature
The creature that has become this Fortress was once, in fact, a Trinity Siren. The Siren, feeling a desire to protect it's people, forced itself to evolve into a shelter large enough to sustain them all during a crisis. These fortresses typically serve as the center for a Trinity city.