Demon Gate is the zenith of dark fantasy RPing. Koth is grim and grisly, with danger at every turn. No review I leave can do it justice. I suggest purchasing this book and finding out for yourself.
The system is both familiar and totally unique. Skill checks are, I dare say, innovative. These check work on a dice ladder, where the better you are in a skill, the bigger your dice get (and more dice too, as you go up). Combat can be lethal, and magic is scary, both to the target and potentially to the caster. There's never a better feeling of ACTUAL tension in combat.
Demon Gate's systems and theme enhance RP, story telling, and character development. I 100% recommend Demon Gate to anyone. If you're looking for one Dark Fantasy RPG to put on your shelves, this is it.