Legacy Weapons are powerful weapons created in an age long past to combat a threat to humanity.
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The Legacy Weapons are OOPARTS that have been excavated by humans. They all have incredible power, on par with the Nox Nyctores that were based on them, but have a cost for using them. Currently there are four known Legacy Weapons: Signati Gladio Crystalis: Murakumo, Sealed Spear: Izayoi, Sword of Destruction: Kusanagi and Gallia Sphyras: Outseal. However, Outseal is not a true Legacy Weapon, but rather a replica made by Kokonoe of equal power to the originals.