Internal Hemorrhage

Causes

Bludgeoning or Force Damage Injuries 
Piercing 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 for that round and can't use reactions until the start of your next turn. Additionally, you gain vulnerability to bludgeoning damage.

Treatment

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