Your chanting creates a wave of negative energy that spreads out from you, dealing 1 point of damage per two caster levels (maximum 5 points) each round to all living creatures in the area of effect. If a creature makes a successful save, it is immune to the effects of that particular casting of the spell (even if it leaves the effect but later enters it again). A creature that fails a save stops taking damage if it leaves the area, but resumes taking damage if it enters again later. Because undead are powered by negative energy, this spell cures such creatures of a like amount of damage, rather than harming them.