As the war dragged on, the Greek prophet Calchas began to divine several conditions that had to be met before Troy would fall. Which of the following are among them? The Palladium, a protective statue, had to be taken from Troy. Neoptolemus, the son of Achilles, had to be brought from Greece. The bow and arrows of Heracles had to be brought to Troy. The Wooden Horse must be constructed Podalirius, the physician, had to be summoned from Epidaurus. Polyxena, the daughter of Priam, had to be sacrificed.