Severe Neuralgia

Causes

Acid Damage Injuries 
Cold Damage Injuries
Fire Damage Injuries
Lightning Damage Injuries
Radiant Damage Injuries

Symptoms

Whenever you attempt an action in combat, you must make a DC 15 Constitution saving throw. On a failed save, you lose your action and can't use reactions until the start of your next turn.

Treatment

The injury heals if you receive magical healing of 6th level or higher. Alternatively, the injury heals on its own after 21 days.