SRD:Cure Critical Wounds
From D&D Wiki
|This material is published under the OGL|
|Level:||Blg 4, Brd 4, Clr 4, Drd 5, Healing 4|
|Casting time:||1 standard action|
|Saving Throw:||Will half (harmless); see text|
|Spell Resistance:||Yes (harmless); see text|
When laying your hand upon a living creature, you channel positive energy that cures 4d8 points of damage +1 point per caster level (maximum +20).
Since undead are powered by negative energy, this spell deals damage to them instead of curing their wounds. An undead creature can apply spell resistance, and can attempt a Will save to take half damage.