Buffy the vampire slayer/Charmed/Harry Potter.
Plot: Xander must some how become a dark lighter from the charmed universe.
Rules: This story must be a Harry Potter/Charmed/Buffy crossover.
Xander must become a dark lighter, he can be made one by the forces of evil or he can born one and had his powers sealed by the powers that be.
Xander must be evil in this story, he can become evil instantly/the minute his powers are unleashed or he can slowly fall and become evil by first doing very small bad things until he becomes pure evil.
Xander must seduce Willow, Faith, Dawn, and Amy to the dark side. you can add others if you want but Willow, Faith, Dawn, and Amy must become his evil lovers/followers/minions.
Xander must have a pairing with one or more women from the TV shows.
Xander's desire and purpose is simple seduce the fighters of the light to the dark and if he can't make them evil then he kills them.
If Buffy isn't seduced into being evil then she must be killed off. Giles should be turned by a vampire and then unleashed onto the council of watchers.
Powers Xander should have: Dark orbing. sensing the evil inside of others and slowly bringing it out until they commit an act of evil and become evil permanently. Summoning a crossbow that can kill anything with poisoned arrows. the ability to kill with his hands. spell casting. Able to make more dark lighters. and immortality.