Crucio (Cruciatus Curse)

Choose a creature you can see within range. It must succeed on a constitution saving throw or be wracked with pain. On a failed save it takes 4d10 psychic damage, or half as much damage on a successful one, falls prone, and is considered stunned. Whenever the target takes damage and at the end of every 10 minutes, which causes an additional 4d10 psychic damage, the target can repeat the saving throw ending the effect on a success. If this spell persists on the target for 1 hour or the target is reduced to 0 hit points by this spell the target must make a charisma saving throw. On a failed save, the creature's Intelligence and Charisma scores become 1. The creature can't cast spells, activate magic items, understand language, or communicate in any intelligible way. The creature can, however, identify its friends, follow them, and even protect them. This effect is irreversible