No, no, no! I really like the idea of them having to be together to use the power! I agree, it will give him a reason to be protective of her which could lead to many things including him leaving his coven. Our whole idea is that the two of them are going to start a coven together, right? So a shared power like that is great!

I have been searching through google and still no amazing power. The strongest one I can think of is the ability to control all the elements but that seems a little to common to me....