Health is a character's stat that determines the total number of health points, aka hit points, that character (Main Character or Mercenary) has.

If Health reaches 0, the character dies. If a character that is not the Main Character (aka a mercenary) dies, the mercenary can be resurrected during battle. Main Characters can only be resurrected out of battle.

Depending on the type of combat and other circumstances, the character can be healed prior to reaching 0 health or even resurrected after death.