Quote Originally Posted by Duman View Post
Lasers cut through them like butter. Even fast moving projectiles would impart enough momentum to break their bones, like a kevlar vest. Blow darts would work. Sling shots. Energy beams.....
Dune canon is that if you use a weapon like a laser gun or regular gun, it causes a reaction with the shield that's the equivalent of lighting off a small nuke, killing everyone.

Hence the use of swords.