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When you cast this spell, you can assume the form of any Diminutive, Tiny, Small, Medium, Large or Huge 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: Burrow 30 feet, climb 90 feet, fly 90 feet (good maneuverability), swim 90 feet, all-around Vision, Blindsense 30 feet, Darkvision 60 feet, low-light Vision, scent, Constrict, Disease, DR 5/—, fear aura, grab, jet, natural cunning, overwhelming, Poison, Pounce, rake, 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, 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.
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.