Polymorph, Greater (Large Water Elemental)

The target creature becomes a large water elemental. It gains a +2 size bonus to its Strength, a –2 penalty to its Dexterity, a +6 size bonus to its Constitution, a +6 form natural armor bonus to AC, resist cold 20, and vulnerability to fire. It also gains two 1d8 slam attacks and the freeze ability. 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. Freeze: A water elemental deals 1d8 cold damage in addition to damage dealt on a successful hit in melee. Those affected by the freeze ability must also succeed at a Reflex save or start freezing, taking 1d8 damage each round for an additional 1d4 rounds. Creatures that hit a freezing creature with natural weapons or unarmed attacks take cold damage as though hit by the freezing creature and must make a Reflex save to avoid freezing.