You yield control of your body to your spirit hunger, taking on a powerful new form with two claw attacks that have a chance to drain spirit energy from spirits and being with souls on hit, in addition to inflicting extra negative energy damage. Your attacks also stand a chance to paralyze your target. You get DR 15/divine, and immunity to cold, electricity, and mind-affecting spells. Craving rises sharply upon activation of this ability, and is retained when you revert to your original form. Lasts twenty rounds or until cancelled with "cancel polymorph". Costs a use of Devour Soul