Xander could easily kill vampires if he gained Ginji's powers, who is able to generate electricity from his body. His power also gives him the ability to summon lightning, magnetism, and a rapid-healing ability.
Ginji is from anime 'Get Backers'. I haven't watched this either but when I looked it up on the net, I though 'why not?' and added it! ^_^
ALSO: I don't own this, or that, or anything!! ^_^'