In Greek mythology, the Palladion was a statue of Pallas Athena that resided in the city of Troy. As long as the statue remained within the city's walls, Troy was under the goddess's protection and could not fall. Two famous Greek heroes, Odysseus and Diomedes, sneaked into the city and stole the statue from its shrine, later allowing the Greeks to take the city. According to legend, the Palladion later turned up in Rome, possibly being brought there by the Trojan exile Aeneas.
 In Game
Due to the fact that she was designed to combat wild Shadows, she was given a simulated human will program that enables her to summon a persona. The first known use of the Persona was when she first encounters Death after the research lab accident. Aigis couldn't defeat it with her current powers, so she seals Death in the Protagonist's body as young boy.
Palladion uses mostly physical attacks, since it's more of a machine than anything else, but it also uses some support magic, although rarely. After Aigis is severely damaged fighting Ryoji and undergoes repairs, she begs that the hero finish off Death so that she doesn't have to see anyone suffer. But when she finds out that they prefer to face the unbeatable threat head on, her resolve changes, and Palladion gave rise to Athena.
Persona 3: Kill Rush, Swift Strike, Sukukaja, Rakukaja, Fatal End, Tarukaja, Dekunda, Masukukaja, Heat Wave, Marakukaja, Matarukaja