Classes that draw power from the primal power source are:
Primal classes and powers were introduced in the Player's Handbook 2. Characters who use the primal power source draw their strength from the wilds around them. Whether it's a fierce animal spirit or an ancient spirit that represents the landscape, a primal character draws power from the primitive, primordial power of the world around them. Primal powers are also called evocations.
The following feats require a primal power source