This weapon is a variant of the Sniper Rifle, which can be fired more quickly, and has a larger blast range. Like the Demon Launcher, it destroys the target instantly if it successfully makes contact with the opponent, which makes it particularly useful against vehicles.
It is capable of defeating Wolf in one shot, whose five-star health rating allows him to survive a single hit from a Sniper Rifle when at perfect health. The Demon Sniper appears in locations where other special weapons can be found, such as the Fireburst Pod, and it can be removed from matches by turning off "Special Weapons" in the match rules on the map selection screen.
Official Site description
“Demon Sniper: A deadlier version of the sniper rifle. It will destroy Arwings and Landmasters with a single shot.”