Your upper body is unchanged, but your lower body is replaced with a long, serpentine form. It possesses enhanced strength, is extremely flexible, and it is fairly silent when moving.
You also gain a minor T0 Thinker power, granting you the ability feel the vibrations and movements of objects, creatures, and people around you through the ground, allowing you to "see" without using your physical eyes. You can even distinguish between the different types of stone, earth, and metal you touch.