By using this spell the caster causes the victims blood to instantly change to dust. The victim is allowed a saving throw vs. spells to escape the effect. A failure to this saving throw means instant death. If the victim makes the save his lungs are filled with dust and they must spend 2 rounds coughing it out before they can do any other actions. They have to spend another 10 rounds of heavy breathing before they can cast spells.
The material componet for this spell is a dust covered ruby(100gp value) and a drop of the casters own blood.