Power Word Kill

You utter a word of power that can compel one creature you can see within range to die instantly. If the creature has 100 hit points or fewer, it dies. Otherwise, the spell has no effect. The word is not spoken in any mortal tongue; it is a syllable of unmaking, a fragment of the sound Solveig made when she tried to unmake the sun. It should not exist in any mortal throat, and speaking it leaves a taste of ash and iron that lasts for days.