Yeah, the 3 second cast time really kills Clemency. It should be instant with a 30 seconds cd. Some people would say that's OP, but the skill encourages that you use it on them. Why else would if reward you with 600 potency back? Heck, it takes like 40% of our total MP and is on the GCD (WAR is off the GCD). I would say that's worth a saving heal. It's useless as others have stated with the cast time. If it was instant, we could save people from the brink of death if they got hit really hard by something, but as of right now, no.