So you know those tier 3 gremlin healers that heal each other? They make a light AoE that helps heal each other. So what about making a healing bomb that does the same thing?
*Edit: A healing bomb with a cooldown time to avoid spamming -_- how bout that?
*Edit 2: FINE instead of cooldown (since this game doesn't use the word cooldown) A VERY LARGE CHARGE TIME.
GIVE IT THE SLOWEST OF THE SLOW charge time, so no one can complain about how to spam it for endless heal. That means the healers have a risk of getting hurt while trying to charge it.
*Edit 3: and no it will NOT HURT enemies. and will heal EXTREMELY SLOWLY, because heaven forbid us for healing in this game
Happy with the explanation now?
Then, everyone can huddle up after each room and spam heal.