Plent plague split from plent fever. It was only known on Ovi Island. It is a horrible disease that is spread through unsanitary conditions. When plents eat things with poop/vomit on them they can get infected with plent fever. Its effects are weakness, stomach pains, headache, chills, delirium, confusion, loss of appetite, vomiting and of course a high fever. Eventually the fever will get so high it dies. It was so effective that it killed all the plents on Ovi Island in a matter of decades.