Chapter 421: One of Us
"Instant Mass Healing is the ability to instantly heal injured team members back to full health status. As long as there's a fraction of a second of downtime, it can heal through it. In other words, as long as an attack doesn't instakill, even if a group focuses their fire, they can't kill the target, because the focus fire doesn't happen in a single move and there's downtime between attacks. This is known to be the most powerful healing skill to date and is probably Lapis Lazuli's Class Exclusive Skill that requires Energy Value to use. However, releasing such a powerful healing skill for the entire group can only last for a minute or two before all the Energy Value is consumed."