If you want to kill the person you hate the most, or get revenge, it's easy, go to a dark alley, close your eyes until you feel different when you open your eyes you'll be in the dark city there's not a little bit of light. Now walk out of the alley if you hear a noise run silently from it, now keep walking until you see the shadow of a boy if you can at least see it, he won't have eyes, and he'll ask you to give him one of yours, you give him the left one, it'll hurt a little, but there'll be no blood nor scar, now walk to the opposite direction you'll see a man standing he'll ask you "do you want to take revenge?" you'll answer yes and say the name of the person. the man will say "now your revenge has been granted that person is now blind", now you walk back to the alley close your eyes and you're back. But if you want to kill him, after leaving that person blind you'll walk back to the kid and give him your right eye too, walk back to the man and he'll ask again, you'll say yes and the name of the person, your revenge has been granted now that person is dead. but now you're blind and you can't get back, now you'll have to live in the lonely, dark city, and with no eyes,
I should have warn you before, sorry!