When I tend to get writer's block, it usually helps me to visualize my story in my head and then ask myself "Now where am I going with this?" If you're starting a new story, usually it helps me to take a break from writing for a while. Try odd things, maybe take a walk just to think, ect. ect. and eventually develop an idea off of that. Sometimes you can even branch an idea off of a drawing you may do. ^_~ Writing comes from what the author knows, so try to get to know more. Maybe do research on something interesting (such as mythology or swords). You could be very surprised of where ideas lurk. ^_~
Hope I was of some help!