Percy Jackson has to defeat Kronos once and for all! This is his chance! The battle rages on as Monsters vs. Half-Bloods, and Kronos is on Mt. Olympus (600th floor of the Empire State Building)! The Gods and Goddesses Are busy fighting Typhon, the storm giant, so they can't help Percy. All of the Half-Bloods are either injured or dead, so he won't get help from them either. It's up to Percy to stop Kronos and the remaining monsters alone.