Trystan's Tower

Trystan's Tower is a small prismarine sea fort discovered off the Astheria by Trystan Chesterfield on one of his many mapping expeditions.
== Appearance ==
Trystan's Tower is small sea fort, and archeological site, made with prismarine that is in a state of disrepair. The top two levels are the look out and the guard house. The top levels are made out of solid prismarine while the lower level is a pit fall trap re-enforced with obsidian. The unique color of the building allows it go go completely unnoticed form a top down view.
== History ==
The origins of the blue tower are unknown, as are the tower's builders. Much speculation surrounds the tower, with theories ranging from it being an ancient resupply station, a sacrificial alter to gods unknown, a coastal watchtower, a form of prison, a burial site, or a military's outpost, among others.
The first theory is possible, though the tower is not large enough to resupply many large ships, and would likely often need supplies itself. The second theory is mostly disregarded, for there is lack of substanciation of any sacrifice, animal or otherwise, occurring at its location. The third is possible, though it is far out of sight of land. The fourth one is also possible, as the pit fall could be an oubliette, a form of pit-cell found in dungeons. The fifth one is possible and considered likely due to the fact that one of the contents was the withered remains of a humanoid skeleton, the magical nautilus shell may have been used as a religious or symbolic artifact, and that the pit fall trap may have been guarding the skeleton. The last one is also likely due to the fact that the guard house contained may holes a bow or other ranged weapon could have shot through. 
The tower was discovered by the Astheryan cartographer Trystan Chesterfield, on one of his many voyages of discovery.