Abilities to buff and defend our party members.
I liked the healing in con, it was just to weak (imo). Having spec that makes con heal and buff allies seems simple enough.
Make it meaningful and powerful, enough so that players are running to it! That likely means it needs to buff their dps.
People run out of healers healing circles like crazy, but would they run out of a 5% DPS buff circle… I think they would die in it!