Healing ritual and Stealth compliment each other well. At 9/9, stealth increases attack speed by 90% for 4.5 seconds and makes your hero invisible can't be attacked. So the hero would throw out a bunch of attacks and heal up. Could probably get close to ten hits in once in stealth. If your hero is level 30 breakthrough and max destiny, has around a million hit points, 5/5 healing ritual heals for 5% max health(?) - looking at 500k healed.