Concussion

Description (Slinger)
Concussion, Removable Debuff

You have suffered a concussion, and if untreated, this damage will worsen and eventually become permanent. -4 to Agility, Intellect, and Wisdom. -2 to Charisma, Strength, and Endurance. Additional symptoms of a concussion may occur.

Reference
Chapter 44 "The Great Escape"