premise: The Malloreon is a five-part fantasy book series written by David Eddings, which follows "The Belgariad". The Malloreon is set in the same world as The Belgariad, but expands on several aspects of the setting, especially the eastern continent of Mallorea.
hypothesis: David Eddings quit the series after the fourth part, leaving it without an ending.
reason: The context clearly says it's a five-part series by David Eddings. If he quit it before the fifth part, then logically there would be no fifth part, and no ending to the series. Perhaps the system thought my statement was open-ended, although saying "leaving it without" should have been explicit enough.