Avada Kedavra

You utter the words Avada Kedavra that can compel one creature you can see within range to die instantly. If the creature you choose has 20 hit points or fewer, it dies. Otherwise, the spell has no effect. For every level above first level it adds 10 hit points to how many they must have to die an example would be 2nd level would be 30 hit points 3rd level would be 40 and so on.