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When you cast this spell, you can assume the form of any Tiny, Small, Medium or Large corporeal Creature of the Undead type, which must be vaguely humanoid-shaped (like a ghoul, skeleton, or zombie). If the form you assume has any of the following abilities, you gain the listed ability: climb 60 feet, fly 60 feet (good maneuverability), swim 60 feet, Darkvision 60 feet, low-light Vision, Blood Drain, DR 5/bludgeoning, scent, Freeze, grab, mimicry, Pounce, shadowless, Sound Mimicry, and trip.
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, but not for other effects that specifically target or react differently to Undead (such as Searing Light).
In this form, you gain a +4 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.
Tiny Undead: If the form you take is that of a Tiny Undead, you gain a +4 size bonus to your Dexterity, a –2 Penalty to your Strength, and a +1 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 +4 size bonus to your Strength, a –2 Penalty to your Dexterity, and a +4 natural armor bonus.