Gratias tibi ago

Gratias tibi Ago is a special ability the four elemental wizards of Asgarnia have. If you shoot a spell of the wizards type on him, he will shout "Gratias tibi ago!" and it will heal the wizard. For example, you do nine damage on a earth wizard, you cast earth wave on him, he will shout the words and will be healed. The elemental wizards are the only ones known to have this power, but Malignius Mortifer, their leader, would probably have teached it to them so he knows it too, although he has no use of it as he cannot be attacked.