Beast Shape Stance

School beast (stance) [polymorph]
Action 1 simple
Range personal

You adopt the shape of a beast. If the beast that become has any of the following abilities, you also gain it: climb speed, fly speed, swim speed, darkvision (up to 60 feet), low-light vision, and scent. New movement types that you gain have a speed equal to your land speed. If you already possess any of those abilities, their effects do not stack, and you use the best version of the abilty.

Refinements

Altered Beast (+1)

In addition to the abilities granted by base form of this art's foundation, choose three of the following abilities to gain if the beast you shaped into possesses them: burrow speed, blindsense, tremorsense 60 ft., breath weapon, constrict, ferocity, grab, jet, poison, pounce, rake, rend, roar, spikes, trample, trip, or web. In addition, if the beast has immunity or resistance to any elements, you gain resistance 1 to those elements. If the beast has vulnerability to an element, you gain that vulnerability.

Size Shift (+1)

Increase or decrease the size limit of what beast you can transform into by 1 step. Your land speed changes to the beast's land speed. For each step larger, you gain a +1 size bonus to Strength and Constitution, a -1 penalty to Dexterity, and +2 size bonus to your natural armor. For each step smaller, you gain a -1 penalty to Strength and Constitution, a +1 size bonus to Dexterity, and a +1 size bonus to your natural armor.