Disease Eater. Viirets feed on diseased flesh and plant matter. The swamplands they inhabit are rife with maladies, giving them plenty of opportunity to find food. Viirets have an acute sense for diseased matter, regardless of the disease's source. While they aren't bothered by eating untainted prey, such prey isn't as nutritionally satisfying. Their stomachs quickly burn through healthy prey, leaving the viiret hungry shortly afterward.