The Demon Launcher (also called the Devil Launcher) is a type of heavy weapon that is given to any losing player in Star Fox Assault'sVersus Mode.
Just like the Homing Launcher, it has an auto lock on feature and predator rockets. There are only 3 rockets, but they can achieve a one hit kill, unless the target is inside a vehicle. It is ideal to attack winning opponents with the weapon.
Official Site description
“Demon Launcher: A rare weapon. The Demon launcher is available to losing combatants to balance the battlefield and challenge opponents.”
—Devil Launcher description on the official site.
Instruction Booklet description
“Demon launcher: This weapon is available only in Vs. Mode. it fires enormously powerful homing rockets that kill with one hit.”