Polymorph (Small Earth Elemental)

The target creature becomes a small earth elemental. It gains a +2 size bonus to its Strength, a +4 form natural armor bonus to AC, and a +1 bonus to its attack rolls, damage rolls, and combat maneuvers. Its movement speed is reduced by 10 feet. It also gains one 1d6 slam attack, resist acid 20, and vulnerability to electricity. The subject may choose to resume its normal form as a full-round action; doing so ends the spell for that subject.