There is a time, where the Heal or even the Great Heal spell are not enough to save a companion's life. If the injury is so grave, or if the injuries are mixed with other negative effects like poison, a truly potent healing spell like this one is needed. Not only does it heal all of the patient's injuries, it also erases any kind of negative effects. It is the strongest healing magic available.
However, the spell is very taxing on the caster, and thus can't be spoken often.
- It actually does heal the whole party completely!