A holy water cannon sounds like the ultimate anti-vampire weapon.
…You know, all those survivalists are really gonna be up shit creek if we get a vampire apocalypse, instead of a zombie apocalypse or a men-in-black-helicopters apocalypse or one of those. They’re mostly Baptists or some similar flavor of rural Protestant, and everyone knows you need a Catholic priest to make holy water.
Episcopalian at the least.
