Avada Kedavra

Instantly kills the target creature, given that they are made of organic material and not undead. The castor goes insane after casting the spell. While insane, you can't take actions, can't understand what other creatures say, can't read, and speak only in gibberish. In addition to the normal effects of insanity, intelligence and charisma saves automatically fail. A greater restoration spell cast on you ends this effect, as does a long rest.