The Water Gun XVS was a modified water gun designed by Xander Harris for use by Buffy Summers. It was due to his time as a soldier on Halloween in 1997 that gave him the knowledge to construct this weapon. It featured two tanks, one for holy water and the other for hellfire, and Buffy would switch between the two on the fly. This allowed her to break down mystical barriers with the holy water and dense web structures with the hellfire.