Bacterium troianocyst
B. troianocyst is a descendant of B. kleptospiritus, a parasite that infests the bloodstream of Suboslontids and Macrognathids through their gills. For troianocyst, this is only a stop on the way to their final destination.
Troianocyst, once inside of a Suboslontid, will find a place to settle and begin forming a cyst. During this process it expands and reinforces its cell wall, and its flagella eventually drop off. Once ready, the cyst will begin filling with zoospores, which are able to lay dormant for months. After the host is eaten by a predator, the cysts travel through the predator's digestive system, the zoospores protected by the reinforced walls of the cysts. When the cysts reach the predator's intestinal tract, the wall of the cysts, weakened by the predator's stomach acids, breaks open, releasing the zoospores which make their way through the intestinal lining by destroying epithelial cells and into the bloodstream. From there they will mature into adults and quickly reproduce, able to release new zoospores after just 20 minutes. Feeding on the nutrients in the host's bloodstream, the host soon becomes fatigued, and, in the case of wyvern hosts, unable to fly.
When the host dies, the mature cells exist the host back into the water to repeat the process. If there is no water near the host's corpse, the cells simply die off.
Because they are able to get access to much larger hosts than their predecessor, their numbers multiply far more rapidly, allowing them to quickly overwhelm the aquatic ecosystem if left unchecked. Like its ancestor, it grows up to 3μm.
Examples of intermediate hosts include S. communis, S. devilosis, and S. whiskerius, allowing them to infest predators such as A. tridactylus, A. neofoundus, and A. thalassomoloch. However, this is far from a complete list. The intermediate host is usually not killed directly, but the build-up of cysts can cause problems, such as blockages.
