I like Clemency, a very reliable heals that is a really good addition that have many good situation to be used at.
But, the problem is having a spell that function normally like every other spell where attacks does interrupt it very often to be used by a job that is expected to be taking damage makes it a very unreliable spell to be used.
A suggestion, is either have a condition on it where blocking make it uninterrupted or to make it a completely uninterruptible to be used much more often and reliably.