Polymorph, Greater (Large Earth Elemental)

The target creature becomes a large earth elemental. It gains a +6 size bonus to its Strength, a –2 penalty to its Dexterity, a +2 size bonus to its Constitution, a +6 form natural armor bonus to AC, and a +1 bonus to its attack, damage rolls, and combat maneuvers. It also gains two 2d6 slam attacks, resist acid 20, and vulnerability to electricity. It is immune to critical hits and sneak attacks while in elemental form. Its movement speed is reduced by 10 feet. The subject may choose to resume its normal form as a full-round action; doing so ends the spell for that subject.