Well, shields seem to be lacking some variety, they are all completely defensive except for quickstrike which gives aspd, and scarlet which gives 2 health (which are quite useless given the stats of the shield)
So how about:
A shield that return a % of the damage it shields to the attacker. And has some subpar stats compared to most shields.
Yes/No?
Yes sounds good to be honest, but lets have the health for the shield to be a bit low =).