Modern practices of shapeshifting often lead to individuals who can morph their form for that of another human. Primordial shapeshifting, involves a much deeper and profound practice that is incredibly rare to manage, let alone master.
Carnimancy is an art that requires an individuals constant attention, and when perfected and utilized, makes an individual vastly powerful through a mastery of self-biomass morphology, and density/matter manipulation.
The requirements for utilizing this skill to its fullest potential are not only a talent for Primordial art, but a knowledge for biology, anatomy, and especially chemistry.
Through mastering this art, one can create "Pocket buffers" that act like tiny pocket dimensions within oneself, allowing huge amounts to mass to be tucked away. These pockets can not only be used to store biomass, but items and even other people. A Carnimancer can hide away an arsenal, or stow away and free a handful of slaves.
A master in Carnimancy can change from a titan of teeth and tendrils, to a small tunneling worm in a matter of seconds. Through Carnimancy, one can become resistant to almost all physical attacks, immune to all disease and toxins, and extreme cold.