There is a dark resource within all of us, a reservoir of hurt and pain and anger upon which we can draw when the need arises. Most of us rarely, if ever, have to delve too deeply into it. That is as it should be, because dipping into it costs and you lose a little of yourself each time, a small part of all that is good and honorable and decent about you. Each time you use it you have to go a little deeper, a little further down into the blackness. Strange creatures move through its depths, illuminated by a burning light from within and fueled only by the desire to survive and to kill. The danger in diving into that pool, in drinking from that dark water, is that one day you may submerge yourself so deeply that you can never find the surface again. Give in to it and you're lost forever.