Arguably the most powerful artifact in the Xenaverse, the Kronos Stone is named for Kronos, king of the Titans and father of Zeus. After Autolycus steals the Kronos Stone from King Quallus he and Hercules discover that it can manipulate time. Hercules is able to use it to save Serena's life before he destroys it to prevent any further changes to the timeline (HTLJ "The End of the Beginning)."