"The power of Life concentrated in a single word - it's as good as a sword against those with evil souls."Holy Word is a first-level Life Magic spell in Heroes of Might and Magic IV that costs two spell points and does damage to a single Death creature based on the level of the caster.
Not so useful if you're not facing death alignment, however it does do a good amount of damage if you are. You should probably cast a few blessing spells before casting this, though, as they will have a bigger effect over the course of the battle if cast in the early rounds.
This spell is particularly devastating against ghosts, which have high resistance to physical attack, but only fifteen hit points per unit.