"The spirit who said "For we are many," in ancient scriptures. The name comes from the Roman military term for an army of 3,000 to 6,000 men."
Legion is a group of demons based on the story mentioned in Christian literature. In the account, Jesus was said to have healed a man from a region in Caesaria Maritima in the Near East who was possessed by many demons. Jesus casts the demons out of the man, granting their request, and allows them to dwell in a herd of pigs. The pigs then drowned themselves in the Sea of Galilee.
"An evil spirit whose name is derived from the Roman military term. Legion appears in Chapter 5, the Gospel of St. Mark, possessing a human body and uttering the line: "My name am Legion, for we are many." As its name signifies, it is not a single entity, but a vast amalgamation of souls. These souls, driven by hatred and jealousy, have lost all sense of individuality. In classical Latin, Legion's name was "Legio," the term for a Roman military unit of 5,000 soldiers. From this, the name "Legion" came to mean "army.""
—Shin Megami Tensei IMAGINE Compendium
Legion can be contracted in Ichigaya Camp's silver level instance. It appears at night time in Ueno, during the weekend invasion periods in Shinagawa, and in Shinagawa's Catacombs of the Templar Knight bronze-level during the new moon phase. It acts as the regular boss of the bronze instance of Kagurazaka Zhu Que Caverns.
Devil Summoner: Raidou Kuzunoha vs. The Soulless ArmyEdit
"An evil spirit, made of many demons, born when ghosts suffering the same sort of pain bond together. The demons possessed a man from Gerasa, and Jesus cured him by casting them into a herd of pigs."
—Devil Summoner: Raidou Kuzunoha vs. The Soulless Army Devil Chart
Legion is the result of a fusion accident. There are five variations of Legion; normal, magic, heal, physical and rare variants. The rare variant has the passive skill Regenerate, and is the only demon in the entire game to have it.
"The spirit who said, "For we are many," in scripture. A conglomeration of evil spirits that experienced similar pains. The evil spirits see other spirits suffering similar troubles as part of themselves. As they gather, the boundary between the self and others breaks down, and they truly become one entity. The name comes from the Roman military term for an army unit of 3,000 to 6,000 men."