Alone, you are prone to weakness and failure. But part of a team, you can cover each other's vulnerabilities and step in when others need to fall back. None are better than you at taking advantage of strength in numbers, whether it comes to combat, debate, exploration, or invention.
Experience: When you participate in a group roll, or suffer a complication as a result of a Teamwork power, you gain experience in Teamwork.
Complications: Another PC suffers a complication of the GM's choice, and blames you for it.