| Blitzing |
I'm currently writing a viking fantasy saga called Gurðinar's Saga of the Hall under the Mountain. I'm a norse expert myself, it's more of an obession really, but I can give you some tips on viking story writing.
First thing is, vikings did not have the same concept of good and evil that we have. To kill someone was not evil, it simply proved you were the stronger man. So the objective of the campaign should be more of a quest for glory and wealth and honor. The players could be mercenaries fighting for gold or defenders fighting against the forces of Niflheim. You should try to implement some mythical aspect, maybe they could be faced with a fierce Jotun in the lands of the giants or be called upon by Tyr to prove themselves in battle. You'll want to do some research in norse mythology before playing thing. Also, you could include special equipment, such as a spectacle helmet, which would increase your intimidate skill by 2 when worn.