When you cast this spell you can assume the form of any Large or Huge Humanoid Creature of the giant subtype. Once you assume your new form, you gain the following abilities: a +8 size bonus to Strength, a –2 Penalty to Dexterity, a +6 size bonus to Constitution, a +6 natural armor bonus, low-light Vision, and a +10 foot enhancement bonus to your speed. If the form you assume has any of the following abilities, you gain the listed ability: swim 60 feet, Darkvision 60 feet, rend (2d8 damage), Regeneration 5, Rock Catching, and Rock Throwing (range 120 feet, 2d10 damage). If the Creature has Immunity or Resistance to one element, you gain that Immunity or Resistance. If the Creature has vulnerability to an element, you gain that vulnerability.