Deathdrinker
Prerequisites: Ability to cast death knell, evil alignment, Heighten Spell Benefit: When you heighten death knell, the benefits of the spell magnify. For every two spell levels it is heightened, the bonuses it provides and the duration double. For example, a cleric casting death knell from an 8th level spell slot would gain a +8 profane bonus to strength, 4d6 temporary hit points and grants a +4 effective caster level. However the target must have at least twice as many hit die as the level to which the spell is heightened to gain these increased effect. If the creature has insufficient hit die, the bonuses are reduced as if the spell was cast from a spell slot of a level equal to half the creatures hit dice. For example, a death knell heightened to 8th level cast on a creature with 12 hit die would grant bonuses as if it had been heightened to 6th level (Although an 8th level spell slot is still expended).