The foe carries a nasty disease! A character who takes hit points of damage from the foe (and survives) acquires the disease. The infected character does not regain recoveries when they Take a Rest of any sort. The character must Take Down Time and do nothing during that time but rest in bed. At the end of their Down Time, the infected character may make a Body saving throw (against a TN of 12, as per usual) to attempt to throw off the disease.