You substantially increase the likelihood of killing any one living creature, provided it is one of your favored enemies. The effect of this spell are imbued into the casters next melee or ranged attack. If that attack misses, the spell is wasted. It is hits, the subject must make a Fortitude save or die outright. Even if the subject succeeds at the saving throw, it still suffers 2d6 damage + 1 point of damage per caster level (to a maximum of 2d6 +10 damage) in addition to whatever damage the weapon used to make the attack inflicts.