My son and I had so much fun with the Nerf N-Force Nerf N-Force Shadow Fury (Blue) swords that I decided it was time for an upgrade and ordered a pair of Marauder long swords - one red and one yellow. The Shadow Fury blades are super fun, but when you hold one of these babies you make a much more convincing knight.
Not only does it look cooler, the Marauder is longer, heavier and more durable than the Shadow Fury. It's sturdy enough to knock notches into the Shadow Fury, and hard enough to actually hurt a bit if your opponent gets past your defenses. My son is a little guy, so for him the Marauder is a two-handed weapon. An adult can swing this sword and keep a second hand free for a shield or a secondary weapon like the Nerf N Force Klaw Hatchet.
This really is the best weapon in the N-Force line. Yes, it's fairly pricey, but it's so much fun to battle an opponent with one of these swords in hand. You can get by with just one if you're going up against someone with a pair of Shadow Fury swords or a heavy weapon like the Nerf N-Force Warlock Axe - Yellow or Nerf N-Force Battlemaster Mace Axe, but ideally you want a pair of these for the best knight-style battles.