Harm
From HGWiki
Caster Level: Cleric 6; Druid 7
Innate Level: 6
School: Necromancy
Descriptor(s): Negative
Component(s): Verbal, Somatic
Range: Touch
Save: None
Spell Resistance: Yes
Area of Effect/Target: Single
Duration: Instant
Additional Counterspells: Heal
Description: If the caster makes a successful melee touch attack, harm uses Negative energy to reduce the target creature to 1d4 hit points. This spell has a reverse effect on undead, healing the targeted undead to full health instead of harming it.
Notes
There are some legendary level creatures for which Harm does not have the maximum effect but still can do significant damage.