I'm largely happy with what I have done to the earlier level spells, but this one was hard to write, so I'd like some proofreading and balance input.
Malefic Metamorphosis is my rewrite of Baleful Polymorph, and functions rather like the object-to-creature use of PaO, other than that, everything here should be familiar to you.
Polymorph Any Object
Transmutation (Polymorph)
Level: Sor/Wiz 7
Components: V, S, M, (and possibly XP, see text)
Casting Time: 1 Round
Range: Close (25 ft +5 ft/2levels)
Target: One creature or object of Gargantuan or smaller size.
Duration: Variable, see text
Saving Throw: Variable, see text
Spell Resistance: Yes.
You change one object or creature into another object or creature.
Used to change one creature into another creaute,
Polymorph any object can duplicate the effects of either malefic metamorphosis or polymorph other, save that polymorph any object can also affect non-living creatures (such as constructs and undead) and creatures normally immune to polymorphing (such as plants) with those effects.
Used to change an object into a creature,
You change the object into an animal of Challenge Rating 1 or lower. The object’s type changes to animal, and it gains the augmented subtype. While transformed, the subject loses any subtypes it may have, save for augmented, shapechanger, chaotic, evil, good and lawful, all of which are retained. This change of type may render certain ongoing spell effects irrelevant, if a continous spell would not affect a creature of the target’s new type, its effects are surpressed while the target is transformed but the duration of the surpressed spell still expires normally.
The subject gains the hit dice, hit points, size, speed, natural armor bonus, attack forms, space, reach, special attacks, special qualities, physical ability scores, and extraordinary abilities of the new form. The subject also gains the mental abilty scores and mindset of the assumed form.
You can freely designate the new form’s cosmetic physical qualities (such as hair color, skin color, gender) so long as they fall within the normal range for the new form’s species. If you use this spell to disguise the subject as a particular animal, you get a +10 circumstance bonus on your Disguise tjeck (and the casting time of the spell replaces the usual time needed to create a Disguise)
This effect lasts for 1 day per caster level or until dispelled. A magic or attended objects gets a Fortitude save to negate this effect.
This effect can be ended in a number of ways. Break Enchantment, Dispel Magic, Remove Curse, Limited Wish, Miracle, Wish and similar effects all dispel the polymorph. Furthermore, any other [polymorph] effect on the subject (including Alter Self, Wildshape, Alternate Form, or even a second Polymorph any Object) can be used to dispel the effect and restore the subject to its original form.
If the transmuted object is slain while in the creature form, it automatically reverts to its normal form (now broken) and the effect of polymorph any object ends with the subject’s death.
Used to change one object into another object:
Polymorph any object can duplicate the effects of Fabricate, Make Whole, Stone Shape, Wood Shape, Warp Wood, or Major Creation. At the DM’s option, polymorph any object may duplicate similar tranmutational spells or have other effects in line with the power level of those spells.
Used to change a creature into an object:
Polymorph any object can be used to change a living creature into an object. The subject gets a Fortitude save to resist this effect. If the save is failed, the subject is changed into an object of your choosing. You may choose to transform the subject into any object within one size category of the subject’s intial size and composed of vegetable matter, stone, crystal and/or base metals (but not precious metals, gems or rare metals). This change may render certain ongoing spell effects irrelevant, if a continous spell would not affect a creature of the target’s new type, its effects are surpressed while the target is transformed but the duration of the surpressed spell still expires normally.
This polymorph takes one full round to take effect, so that a shapechanger or spellcaster may be able to negate the spell via one of the means below before being rendered completely inert.
While in the transmuted form, the subject is mindless and inert. If the subject sufferes damage or breakage while in the assumed form, the subject has similar damage and breakage when it reverts to its normal form. If the transmuted form is destroyed, the subject dies and the spell ends.
You may choose to transform the subject for 1 day per caster level, or you may choose to transform the subject permanently. If you chose to transform the subject permanently, you must spend 500 XP and set a condition by which the spell may be broken. When the condition is met, the subject reverts to his or her true form. You cannot set a condition that is the same as any of the other means of ending the spell.
This effect can be ended in a number of ways. Break Enchantment, Dispel Magic, Remove Curse, Limited Wish, Miracle, Wish and similar effects all dispel the polymorph. Furthermore, any other [polymorph] effect on the subject (including Alter Self, Wildshape, Alternate Form, or even a second Polymorph any Object) can be used to dispel the effect and restore the subject to its original form. Additionally, breaking the object ends the spell, although that also kills the subject.