Blood Sacrifice

Through a bloody sacrifice to his god, the caster sacrifices their own life force to empower an item. 

Any weapon is granted an additional +1 on any damage roll for an attack by this weapon per 5 health points sacrificed.
Any weapon is granted an additional +1 on any attack roll for an attack by this weapon per 10 health points  sacrificed.
Any armor is granted an additional +1 armor class per 20 health points sacrificed.

This spell can only grant one effect per item, but the effect is stackable. Recovering the sacrificed health points does not cancel the effects of this spell.