Brain Injury.

Causes

Psychic Damage Injuries
Bludgeoning or Force Damage Injuries Thunder Damage Injuries

Symptoms

You have suffered a brain injury. You have disadvantage on Intelligence, Wisdom, and Charisma checks, as well as Intelligence, Wisdom, and Charisma saving throws. If you fail a saving throw against bludgeoning damage, force damage, or psychic damage, you are also stunned until the end of your next turn.

Treatment

Magical healing of 6th level or higher can restore your full brain function. Alternately, it heals on its own in 21 days.