The Burning Leaf
A Spirit Dancer is one who takes on the aura and form of a particular spirit during an action. When one enters this “avatar state”, a semi-transparent spirit “shell” (a silvery white umbra) forms around that Spirit Dancer in the shape of whatever animal (or monster?) she is manifesting. Her eyes go white, and this aura is what actually touches things around her: if she claws somebody’s face, it’s the spirit claws that actually touch them, not her fingers.
The only Spirit Dancer we know of is Nina Kahm-Mira.
A Spirit Dancer could be from any race in the Valley, unlike most magical heritages.