Athena looked almost sorry for me. “Kronos knows your flaw, even if you do not. He knows how to study his enemies. Think, Percy. How has he manipulated you? First, your mother was taken from you. Then your best friend, Grover. Now my daughter, Annabeth.” She paused, disapproving. “In each case, your loved ones have been used to lure you into Kronos’s traps. Your fatal flaw is personal loyalty, Percy. You do not know when it is time to cut your losses. To save a friend, you would sacrifice the world. In a hero of the prophecy, that is very, very dangerous.”