Guardian
2set: Melee attacks that hit you while Savage Defense is active are reduced by x%. (Alternatively, to make it work with Guardian of Elune the set bonus could be something like: "Each attack that you dodge while SD is active will put a stack on you that reduces the damage of the next ability done to you by x% per stack".)
4set: Frenzied Regeneration also puts an absorption shield on you for x% of the healing done.