Because Lex hasn't developed minituarizing technology yet? :lol

Seriously though, you can still make the zombies tough, yet have the characters be special. I need to pull out the relevant books, but I think I can suggest some aspects to make the zombies with. When I do, I'll post it over on the AFMBE forum for you
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I just wish Hollywood would really stop looting other stuff. They are the Roman Empire of Film!!- Canadian Pitbull, on Hollywood's obsession with remakes