Shapeshifter Gel

Shapeshifter Gel is a liquid that can solidify or liquefy itself, not requiring to freeze or warm up. Shapeshifter Gel is actually not a gel, but, a liquid in the body of a Wendigoa, which is there from birth. The liquid is commonly either black or white, but also can be other colors. This also has special purposes, including Cores and such.

History
It originated in the Abyssal Caverns, specifically that of the Shade Region. Actually, itself was once a unnamed parasite in that region that adapted to mimicking the environment just for it's lifespan to last longer by slowly draining blood from local wildlife (which there wasn't much of either way). Either way, it had a surprisingly short lifespan of about a year. As the species quickly died out, the genetics of the shapeshifting and the liquid managed to pass into Wendigoa through unknown means.

Quick Regeneration
Unlike normal meat, those who have Shapeshifter Gel take a day, or even a hour, to recover from a wound. However, it only starts when the Wendigoa isn't sustaining any more injuries and they aren't running or even simply moving. Hints why those recovering barely move once they return to their cave or a safe place, over than move around in the safe area. This is caused from the multiplication of the molecules in Shapeshifter Gel, which it is first the skin that has to be healed before the inside as apart of the healing, because the liquid would just pour out either way. It was evolutionary.

Shapeshifting
Shapeshifting is a hard art to master, with plenty of mistakes involved. Those who master it are always pure shapeshfiters who are that of subspecies that are dedicated. It is rare for another subspecies that isn't specific towards shapeshifting to master it unless they are taught. Even some Infernixus are suspected to be able to do this effectively with barely any mistakes.

Harder "Bones"
The cells that are dead often harden and stick to other dead cells in a short amount of time, always sticking to the skeleton of the Wendigoa. When born with the genetics needed for having Shapeshifter Gel, it often has a bone structure as only a "template", and dead cells often stick to that overtime. The dead cells often shape around the bone evenly overtime, including when the Wendigoa is still growing. These bones are often harder than normal bone, making it somewhat a bit more difficult for specifically bone-breaking subspecies.

Subspecies with Shapeshifter Gel
(It is planned to do something about the Lineages, so they aren't here rn)

Trivia/Notes

 * It's actually somewhat unknown why this came to mind, but it might be for a way of shapeshifting.
 * The regeneration ability had no restrictions and was confusing, the shapeshifting also was kind of not that well explained.