Insects native to the jungles and marshes of Chult carry this disease, shivering sickness. The easiest protection against it is a coating of insect-repelling salve on all exposed skin (for the cost of insect repellent, see "Buying A Special Item".
Shivering Sickness
Condition
Status Effect
Shivering Sickness
This condition changes how a creature can act, move, perceive, or interact with the world until the condition ends.
Rules
4
sections
Effects
A giant or humanoid that takes damage from or from , , or is exposed to the disease at the end of the encounter. Those who haven't applied insect repellent since their previous long rest are exposed to the disease when they finish a long rest.
A giant or humanoid exposed to the disease must succeed on a DC 11 Constitution saving throw or become infected. A creature with natural armor has advantage on the saving throw. It takes hours for symptoms to manifest in an infected creature. Symptoms include blurred vision, disorientation, and a sudden drop in body temperature that causes uncontrollable shivering and chattering of the teeth.
Once symptoms begin, the infected creature regains only half the normal number of hit points from spending Hit Dice and no hit points from a long rest. The infected creature also has disadvantage on ability checks and attack rolls. At the end of a long rest, an infected creature repeats the saving throw, shaking off the disease on a successful save.