Simple really. In other RPG's with quest lines like the Dark Brother also have morality systems. Which would severely affect the overall game if you go whole hog into the DB style quest lines. The ES lack of a morality system means you can dive into the psychopathic villainy of the Dark Brotherhood and once it's over, no consequences. And Knights of the nine is supposed to be the polar opposite of the Dark Brotherhood. I actually enjoyed both. Solving the puzzle of what crusader relics to get in what order was a good challenge.
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