I remember reading a book in the late 80s or early 90s about a warrior who had a wizard make him a magic sword, but the type of ring used wasn't the proper metal. Therefore the magic sword had a slight drawback. If I remember correctly, the warrior would die when he killed his 100 person with the sword, so he kept it behind his bar and wouldn't use it unless he had to.
Does anyone remember this book? I want to say it was The Brass Ring or something of the vein, but I truly can't remember.
Update - Thanks to Lord Gwydion from What a horrible night to have a curse (which is a great old-school Scooby Doo reference for all you kids out there), we have identified the book as The Misenchanted Sword. With a little GoogleFu I also found the author's website for the book here, where among other things, you can read the first chapter for free. With the wife out and about today, I'll ask her to swing by my favorite used book store, or if she can't I'll swing by there tomorrow and see if I can find a copy.