This was brilliant! I read the poem first and it increased the sense of dread I had while reading. It's easy to imagine that people in the wizarding world would turn on Purebloods after the war and that Harry (and others) wouldn't react immediately because of how slowly it would happen and because people generally refuse to see that happening in their everyday lives. It made me wonder what I would do. And the ending, hopeful and frightening at the same time because who knows if the power wouldn't corrupt Harry and the others as well. Also, I loved everything about the new mark: Morsmordre (gave me chills) and Vindico (had to go look this one up) being part of the spell, Severus being the one who said it, the form it took and the fact that it's invisible to others (yeah for not repeating Voldemort's stupid mistake). Very well written, thought-provoking story.