Tyrannogladius

Tyrannogladius (チラノグラディウス, Chiranoguradiusu) is one of the single strongest most powerful weapons ever programmed into Sword Art Online, and is considered a legendary item of the most devastating power and supreme rarity. It cannot be found as an item or retrieved as a dropped weapon under any circumstances, and can only be obtained as a player-built weapon, crafted out of only the rarest and most difficult to obtain materials and sources in the game. The Tyrannogladius was designed and programmed into Sword Art Online solely by former SAO developer Genato, who designed the weapon to be an ultimate gift for an aspiring sword user.