The first time a creature approaches within 5 ft. of a creature carrying the bubonic plague, and every hour in proximity thereafter, it must succeed on a DC 15 Constitution saving throw. Onset is after 1d4 days, after which the victim becomes contagious. The victim loses 1d4 points of constitution and 1 point of charisma per day thereafter; they may attempt a DC 15 Constitution saving throw each day to avoid the ability damage; two successful saving throws in a row defeats the disease. If the victim is still alive after 5 failed saving throws, they become incapacitated from cramps and pain. Once the victim is no longer ill, the ability loss heals normally at one point of each ability after every long rest.