Given the question: Extract the answer to the following question from the movie plot. If the question isn't answerable, please output "Can't answer". Question: What is the only weapon that can defeat Kronos in the movie? Title: Wrath of the Titans Movie plot: Ten years after he defeated the Kraken, Perseus (Sam Worthington), the demigod son of Zeus (Liam Neeson), now lives as a fisherman with his 10-year-old son, Heleus (John Bell). One night, Perseus is visited by Zeus, who tells him that the powers of the gods are fading and the walls of the underworld prison of Tartarus are breaking due to the lack of devotion from humans and states they will need the world's armies to combat the potential threat, but Perseus shows little interest and refuses to get involved. Afterwards, Zeus travels to Tartarus to meet with his brothers Hades (Ralph Fiennes) and Poseidon (Danny Huston), and his son Ares (Edgar Ramirez). He tells Hades they must forget the past and unite to rebuild Tartarus, but Hades orders his minions to attack. They severely injure Poseidon, and Ares betrays Zeus over showing Perseus more affection, taking him prisoner and stealing his thunderbolt. Hades and Ares plan to drain Zeus' power to revive Kronos, the father of Zeus, Hades, and Poseidon, in exchange for the two to remain immortal. The walls of Tartarus break, unleashing monsters into the world.After slaying a Chimera that attacks his village, Perseus takes Heleus to the Mount of Idols, so they can speak to Zeus, but the dying Poseidon arrives instead. He informs Perseus that Hades and Ares are holding Zeus in Tartarus, and tells him to meet with his demigod son Agenor (Toby Kebbell) to find the fallen god Hephaestus, who knows the way into Tartarus. Poseidon then gives Perseus his trident before succumbing to his injuries and crumbling into dust. Perseus flies on Pegasus to the campsite of Queen Andromeda's army. Andromeda (Rosamund Pike) has imprisoned Agenor for stealing crown jewels, but Perseus has him released.Perseus, Andromeda, Agenor, and a group of soldiers set out at sea to find Hephaestus, with Agenor explaining that Hephaestus created the three great weapons that Zeus, Hades, and Poseidon wield: Zeus Thunderbolt, Hades' Pitchfork, and Poseidons Trident, and that together they form the...
The answer is:
Spear of Triam