Panmorphs are rare even in the world of shapeshifters. They can literally become anything. Wind, air, energy, symbols. Nothing is limited to them. The trouble with panmorphs is that they tend to forget who they are. You spend so much time becoming the perfect squirrel and you forget that you really aren't a squirrel. A lot of panmorphs lead quiet lives as a rock or a cloud till some trauma forces them to change again reawakening memories of who they truly are.
This was something you needed to know.