You infuse a target’s shadow with energies from the Shadow Plane, shaping the shadow into one that appears to belong to a different creature, and tricking the target into believing it actually is that creature. When you cast this spell, choose one Huge or smaller creature of the animal type or one Medium or Small creature of the humanoid type. If the chosen creature is ill suited to the target’s current environment, such as an aquatic creature not in water, the subject gains a +4 bonus on all saving throws against _baleful shadow transmutation_. If the subject fails its Will save, it believes that it is the chosen creature, causing it to lose its extraordinary, supernatural, and spell-like abilities, lose its ability to cast spells (if it had the ability), and gain the alignment, special abilities, and Intelligence, Wisdom, and Charisma scores of its new form in place of its own. It retains any class features (other than spellcasting) that aren’t extraordinary, supernatural, or spell-like abilities.
When the subject is first targeted by this spell, and once every 24 hours thereafter, the subject must attempt a Will save in order to disbelieve this effect. If the save succeeds, the spell’s effect ends. The first time the subject fails this save, it must also attempt a Fortitude save. If it also fails this Fortitude save, the subject permanently assumes the form of the chosen animal or humanoid, as per [_polymorph_](/spells/polymorph). This is a polymorph effect. Successfully disbelieving the spell returns the subject to its true form. If the subject fails its Fortitude save against the effects of _baleful shadow transmutation_, any further polymorph effects cast on the target automatically fail.
Incorporeal or gaseous creatures are immune to _baleful shadow transmutation_, and a creature with the shapechanger subtype can revert to its natural form as a standard action.