If we are talking about pure damage, then I'd rather see the job gauge provide something of use other then defensive tools. Sure, sheltron and intervention are nice, but I'd rather see different uses than just those 2. Yes, I know cover is there as well.

Anyway, if it has to be clemency, then I'd say a vague cleric stance iteration would suit your idea quite well. During this time Clemency can be used on hostile targets and instead of healing enemies it would damage them. Essentially using the light to damage enemies, but hey, that would just be a different version of Holy Spirit tbf