Known as the Carp, the Third Part of the Will was hidden within a worldlet commanded by Feverfew, hidden in Drowned Wednesday's stomach. Wednesday wished to execute her clause of the Will, but was stopped when Superior Saturday betrayed her. The Trustees (save Monday, who was afflicted with sloth) took Wednesday's portion of the Will and gave it to Feverfew to hide, additionally limiting Wednesday's use of the Key to keeping the shape of the enormous Leviathan she was to become.
Several of Feverfew's escaped slaves hid in a cave on a remote side of Feverfew's island with the Will, in the form of a carp. The Carp proclaimed itself a god, and has accumulated a cult following. The Carp is always preaching about the values of Faith, the virtue it embodies. Arthur was able to free the Third Part of the Will with the aid of Leaf and Suzy. The Carp is in fact a fish.