Invisible to the naked eye, travelers know better than to drink from waters deep in the wilderness for fear of ingesting these stomach parasites. When a creature drinks or otherwise consumes water contaminated by parasites, the creature must succeed on a DC 12 Constitution saving throw or become infected. It takes 1d4 days for symptoms of a stomach parasite to manifest in an infected creature. Symptoms include stomach cramps, taut skin, and extreme muscle definition. Every week, the infected creature doubles the amount of food and water it needs to survive. An infected creature that does not receive enough sustenance regains no healing from short or long rests. A creature can cure the disease with a greater restoration, or an attack or spell that deals 10 points of force damage per week of infection.