Shadow Form
You can become a two-dimensional shadow. This lets you slip along walls and floors – and through the thinnest cracks (anything wide enough to fit your shoulders through) – at your usual ground Move. You can also defy gravity, creeping up walls and across ceilings at half Move.
Physical attacks do half damage to you in this form. Energy attacks do normal damage, except for light-based attacks, which do 50% extra damage. Magic, psi, and other purely mental abilities affect you normally.
You are subject to a few major restrictions while in this form. You cannot walk through three-dimensional space; you must slide along an object. Furthermore, you cannot perform any purely physical attacks or actions, and you cannot carry ordinary items or affect them in any way. You can use magic, psi, and similar abilities, however.
If you cannot switch out of Shadow Form, Shadow Form is a disadvantage worth -20 points. This will make it difficult to interact with others! You may still add enhancements, but they will work like limitations, reducing the value of the disadvantage. For instance, a +50% enhancement would reduce the value of the disadvantage by 50%, to -10 points.
Special Enhancements
Can Carry Objects: You may carry objects. They take Shadow Form when picked up and return to normal when put down. You still may not affect non-shadow objects. No encumbrance is +10%; Light, +20%; Medium, +50%; Heavy, +100%.