A magical mist creeps through the jungles of Chult. Contact with this thin, blue, odorless mist can infect giants and humanoids with blue mist fever. A dispel magic spell destroys the mist in a 20-foot square starting at a point chosen by the caster within the spell's range. An encounter with this mist typically covers 1d6 such areas (400-2,400 square feet).
A giant or humanoid that comes into contact with the mist must succeed on a DC 13 Constitution saving throw or become infected with blue mist fever. An infected creature begins seeing vivid hallucinations of blue monkeys 1d6 hours after failing the save, and the hallucinations last until the disease ends on the creature. A creature can repeat the saving throw every 24 hours, ending the effect on itself on a success.