Cure Critical Wounds

Conjuration (Healing)
Level: Acolyte 4; Components: V, S; Casting Time: Attack action; Range: Touch; Target: Creature touched; Duration: Instantaneous; Saving Throw: Will half (harmless) (see text); Spell Resistance: Yes (harmless)
The caster lays his or her hand upon a living creature and channels positive energy that cures 4d8 points of damage +1 point per caster level (up to +10).
Since undead are powered by negative energy, this spell deals damage to them instead of curing their wounds. An undead creature can attempt a Will save to take half damage.