I totally have a character idea for this, but I think it might be a bit overpowered perhaps? We'll see what the character sheets look like and go from there, of course. But I am thinking of an Angel, might go half angel. But the Angel of Equality, or their progeny. Wields a sword, but can make small conversion fields. The conversion field changes energy from one type to another. So Kinetic Energy could be converted into thermal energy, making a force field that not only stops motion through it, but burns whatever is attempting to pass through it as well. A slow moving object would take less damage then a fast moving object. 

Yay, nay?