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Seadweller mutation theory for homestuck, revamped edition!Basics:
Trolls born with ”Mermaid disorder” (based on mermaid syndrome, as is obvious) do not know about their disorder until they reach the age when their legs grow.
The disorder is exclusive to the seadweller castes.
The disorder causes the legs not to grow, instead the seadwellers grub fins remain and grow with them. Because of the way they form, the bones of their knees are still existent, giving them the ability to bend their knees.
Unfortunately, their bones also become more brittle from the waist down, making it easier for them to become injured despite their natural strength as highbloods, because of this many die during adolescence due to injury.
They are also at higher risk of blindness, eye mutations, and physical deformities.Legends formed around them:
“Mertrolls”, as they are called, are legendary creatures to other trolls. In ancient times a captured mertroll would have been given to the empress as a gift. When the empress recieved the troll, she would have it treated as well as her in hopes the mertroll would bless her reign with success.
If it did not, she assumed the mertroll was being mistreated and would have her entire staff culled.
On rare occasions the empress would cull the troll, usually in situations where she did not believe them anything but mutants or when she was so superstitious she believed eating the mertrolls flesh would give her immortality.
Mertrolls can still fill pails, there is a flap where there crotch would be which moves to reveal a nook, the bulge unsheathes from their bone bulge just like other trolls.
Traditionally they were not required to provide for the pails, but eventually they were.
Survival rates are 50/50 as are gender rates