Knowledge of miracle moved healing powers of priests to completely new levels, however, they still use lesser healing spells to take care of other characters than warriors, as those spells are significantly cheaper than mircle, and for such characters the effect is virtually the same. But as all characters advance to higher ranks, even ultraheal slowly starts to be insufficient. To offset this change, priests managed to learn how to focus their healing power more effectively, thus increasing power of their healing spells. This means that their healing spells will heal more hitpoints than before. Of course this changes nothing with miracle ad its upgrades, as heal to full hp is always heal to full hp.