So my HOLY stat is well over 20,000, which serves as a multiplier for skills. My healing is at over 500%, which is multiplied by HOLY, AND the power of the healing skill you use. I have 3 healing abilities, of 5 total

Moon Heal: Scales off raw HOLY, super low cooldown, has an effect to trigger two heals so it does double damage and destroys enemy barriers as well
Angel Light: scales off of max HP (through the roof), and also boosts heal effectiveness, medium cooldown, also triggers a second heal
Angel Light: this one doesn't heal twice but reduced cooldown
Angel Army: heals damage enemies
Moon Blade: Attacks. Useless now.