1. Do NOT lock the shield behind lillies if you do not GAIN anything from it.
Why does it use 1-3 Lillies if it doesn't benefit from it? What's the point in it having such a big cooldown then? 30 seconds may not be ultra long but... for a single target shield? Why does it use more than one lillie if you have more?
You could make it an Aoe shield that gains more range the more Lillies you have. Or make it have more potency, or anything. Or just give us stoneskin back and make stoneskin 2 usable in combat.
2. How about something like zombie? That could give the enemy a debuff that makes YOUR(gotta be selfish) heals do damage. But to limit it a bit, it doesn't work with off global heals (because benediction... yeah, no). Like short duration with long cooldown but you could just go ham on things with it if you do not need to heal.
3. Why not make confessions work off of regen ticks only? With really low % to prog? AND make them STAY still you use the heal? If the % is really low and you NEED to heal hp with it, it should be more useful than spamming cure 1/2 for BOTH new mechanics.
4. What about an AoE raise? Small radius, long cooldown, maybe locked behind having 3!! Lillies, maybe mega mp. But people do die close enough to each other that that would come in handy and that would work with the pure healer.
5. What about a skill that makes a target regain a portion of they health they lose when they get hit for a bit? Could be used with lillies and it doesn't get more potency, but LONGER duration maybe?
I know it's senseless to throw in ideas and all but I just had those without really thinking about them.
But if you want to make them pure healer, don't take away the one skill that makes them heal like a truck, while keeping healbuffs for the other two healer. There are so many ideas you can play around with if you want pure healer without it being to complicated.