Health is equal to an hero's maximum Health Points, or HP. When your Grinn reaches 0 HP, they will faint. If they are Berserkers, then they will automatically switch out with a party member from the backup party (if available). Grinns who are fainted can be revived with a , or with a . If all of the Grinns in your active party faint, you will be given the option to either return to town, or revive them all for 19 pramins.
A Cleric's attack ability will restore health. Abilities such as , , and will restore health.
The ability raises your Grinn's attack when when they are at low health.