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[Duman]

They fight with knives / sharp instruments, because any type of projectile, is stopped by their shields.

Think of their shields like it's kevlar.

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.....

[Justin]

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.