SRD:Mass Heal

Mass heal enables you to channel positive energy into a creature to wipe away injury and afflictions. It immediately ends any and all of the following adverse conditions affecting the Target: ability damage, blinded, confused, dazed, dazzled, deafened, diseased, exhausted, fatigued, feebleminded, insanity, nauseated, sickened, stunned, and poisoned. It also cures 10 hit points of damage per level of the caster, to a maximum of 250 points at 25th level.

Mass heal does not remove negative levels, restore permanently drained levels, or restore permanently drained ability score points.

If used against an undead creature, mass heal instead acts like harm.