Undead Anatomy IV

Undead Anatomy IV
Transmutation (polymorph)
None
SR: No
V, S, M (piece of the creature whose form you plan to assume)
1 standard action, 1 minute/level, personal
This spell functions as Undead Anatomy III, except it allows you to use more abilities. If the form you assume has any of the following abilities, you gain the listed ability: burrow 30 feet, climb 90 feet, fly 120 feet (good maneuverability), swim 120 feet, all-around vision, blindsense 60 feet, darkvision 90 feet, lifesense 60 feet, low-light vision, scent, tremorsense 60 feet, breath weapon, constrict, disease, DR 5/—, DR 10/magic and silver, DR 15/bludgeoning and magic, fast healing 5, fear aura, fiery death, fire aura, freeze, grab, incorporeal, jet, mimicry, natural cunning, overwhelming, poison, pounce, rake, rend, roar, shadowless, sound mimicry, spikes, trample, trip, unnatural aura, and web.
In this form, you detect as an undead creature (such as with detect undead, but not with magic that reveals your true form, such as true seeing) and are treated as undead for the purposes of channeled energy, cure spells, and inflict spells. In this form, you gain a +4 bonus on saves against mind-affecting effects, disease, poison, sleep, and stunning. If the creature has immunity or resistance to any energy types, you gain resistance 20 to those energy types. If the creature has vulnerability to an energy type, you gain that vulnerability. In this form, you gain a +8 bonus on saves against mind-affecting effects, disease, poison, sleep, and stunning. If the form has a vulnerability to an attack (such as sunlight), you gain that vulnerability.
Diminutive undead: If the form you take is that of a Diminutive undead, you gain a +6 size bonus to your Dexterity, a –4 penalty to your Strength, and a +1 natural armor bonus.
Tiny undead: If the form you take is that of a Tiny undead, you gain a –2 penalty to your Strength, a +8 size bonus to your Dexterity, and a +3 natural armor bonus.
Small undead: If the form you take is that of a Small undead, you gain a +2 size bonus to your Dexterity and a +1 natural armor bonus.
Medium undead: If the form you take is that of a Medium undead, you gain a +2 size bonus to your Strength and a +2 natural armor bonus.
Large undead: If the form you take is that of a Large undead, you gain a +6 size bonus to your Strength, a –2 penalty on your Dexterity, a +2 size bonus to your Constitution, and a +6 natural armor bonus.
Huge undead: If the form you take is that of a Huge undead, you gain a +6 size bonus to your Strength, a –4 penalty to your Dexterity, and a +6 natural armor bonus.

Target: you
Professions
Arcanist [8],Sorcerer [8], Wizard [8].

Material Components
A piece of the creature whose form you plan to assume.
Related School
Transmutation (polymorph)
Effect Duration
1 minute/level
Effect Casting Time
1 standard action
Range
Personal
Legality
Illegal