Use Darion or Velana. Note: Make sure the Hero does not get taken out or the game will end.

Darion can cause damage on two spaces in front of him. Position an enemy between an ally with low health and Darion then use his normal attack.

Velana deals area of effect damage to all spaces around her target with her normal attacks. Have an ally with low health get next to an enemy then hit the enemy with Velanas bomb.