You just described Confiteor in a roundabout way.

Paladin doesn't exactly need more damage, they are pretty well balanced on that department right now.

Clemency isn't as bad either as people make it out to be however, combined with Requisecat it can heal for quite a bit. But anyway, if you are looking for synergy with clemency then I suggest we take a look at Requisecat in the first place.
If we translate it from Latin, then we come to "a wish or prayer for the repose of a dead person." Somewhat we could have a skill called Divine Intervention that synergizes with Clemency, where you trade your Confiteor for example in exchange for raising a dead person.