I came up with a rather good idea for a novel: It would basically be a subversion of your average cliche fantasy movie or novel, specifically the "Obiwan Syndrome".
Basically, it would first concentrate on a young, bratty teenager who becomes an officer in the military. He is bad at tactics, thinks he is superior to the rest of the people in his group, has a "magic" sword with a gilded hilt with gems in it, and in general is not very interesting, getting killed off in the middle of the book with one of the Sargeants in the Officer's group becoming the new focus. He and the rest of the troops don't have any "magic" weapons: just the basic stuff they are equipped with. They are much, much more successful, however, due to the use of tactics, and also the fact that the sword possessed no magical qualities at all.
What if the magic in the sword was bittersweet? Like if it would help you conquer your enemies, but only for a small time before it allowed you to be killed if you didn't have the right tactics or if you used it for long periods of time.
That sounds really interesting. It would through a little spice in if there is someone in the sqaud with a temper.