Change Magic, usually called Changing, is a rare Talent involving transfiguration of the flesh. Someone who is capable of using their Change Magic on only themselves is called a shapeshifter, while if they can use it on others as well, they're called a Changer.
The aura color typically associated with Changing is brown.
Shapeshifting is complete change in physical form between one shape and another without intermediary. The end state must be precisely known beforehand, typically an animal that the shapeshifter is intimately familiar with. Inborn shapeshifters are known as werecreatures, and are instinctively capable of using two or more forms without having to even really think about it.
Shapeshifting is a safer method of changing form than fleshcrafting, since a failed attempt at shapeshifting will simply return the caster to their original form and generally won't kill them.
A more versatile form of Change Magic is called fleshcrafting. A Changer warps and sculpts the subject's body, shaping it however they desire. This form of Change requires a much higher level of skill and caution in order to avoid killing the subject outright.
A powerful enough Changer can not only mold the form of a being, but set it in so deeply that even their children will be affected by the alterations made. Harmony Kimchild shaped entire races of monsters using her powerful inborn Change Magic.