Dark Invocation; 5th
You utter a powerful word that transforms a creature into an inoffensive form. This effect functions like the baleful polymorph spell, except that 24 hours after being transformed, the subject is entitled to a second saving throw (at its original save bonus) to spontaneously resume its normal form.
If this second save fails, it remains in its new form permanently or until restored by some other means.
Source: Complete Arcane
Baleful Polymorph
Transmutation
Level: Drd 5, Sor/Wiz 5
Components: V, S
Casting Time: 1 standard action
Range: Close (25 ft. + 5 ft./2 levels)
Target: One creature
Duration: Permanent
Saving Throw: Fortitude negates, Will partial; see text
Spell Resistance: Yes
As polymorph, except that you change the subject into a Small or smaller animal of no more than 1 HD (such as a dog, lizard, monkey, or toad). If the new form would prove fatal to the creature (for example, if you polymorphed a landbound target into a fish, or a flying target into a toad) the subject gets a +4 bonus on the save.
If the spell succeeds, the subject must also make a Will save. If this second save fails, the creature loses its extraordinary, supernatural, and spell-like abilities, loses its ability to cast spells (if it had the ability), and gains the alignment, special abilities, and Intelligence, Wisdom, and Charisma scores of its new form in place of its own.
It still retains its class and level (or HD), as well as all benefits deriving therefrom (such as base attack bonus, base save bonuses, and hit points). It retains any class features (other than spellcasting) that aren’t extraordinary, supernatural, or spelllike abilities.
Incorporeal or gaseous creatures are immune to being polymorphed, and a creature with the shapechanger subtype (such as a lycanthrope or a doppelganger) can revert to its natural form as a standard action.
Source: Player's Handbook
Polymorph
Transmutation
Level: Sor/Wiz 4
Components: V, S, M
Casting Time: 1 standard action
Range: Touch
Target: Willing living creature touched
Duration: 1 min./level (D)
Saving Throw: None
Spell Resistance: No
This spell functions like alter self, except that you change the willing subject into another form of living creature. The new form may be of the same type as the subject or any of the following types: aberration, animal, dragon, fey, giant, humanoid, magical beast, monstrous humanoid, ooze, plant, or vermin.
The assumed form can’t have more Hit Dice than your caster level (or the subject’s HD, whichever is lower), to a maximum of 15 HD at 15th level. You can’t cause a subject to assume a form smaller than Fine, nor can you cause a subject to assume an incorporeal or gaseous form. The subject’s creature type and subtype (if any) change to match the new form (see the Monster Manual for more information). Upon changing, the subject regains lost hit points as if it had rested for a night (though this healing does not restore temporary ability damage and provide other benefits of resting; and changing back does not heal the subject further). If slain, the subject reverts to its original form, though it remains dead.
The subject gains the Strength, Dexterity, and Constitution scores of the new form but retains its own Intelligence, Wisdom, and Charisma scores. It also gains all extraordinary special attacks possessed by the form (such as constrict, improved grab, and poison) but does not gain the extraordinary special qualities possessed by the new form (such as blindsense, fast healing, regeneration, and scent) or any supernatural or spell-like abilities.
Incorporeal or gaseous creatures are immune to being polymorphed, and a creature with the shapechanger subtype (such as a lycanthrope or a doppelganger) can revert to its natural form as a standard action.
Material Component: An empty cocoon.
Source: Player's Handbook