Spec Epsilon Biograft Energy Sword

The superintelligent cloud people of the distant future find the history of human conflict hilarious and ironic. To that end, they created these weapons to sell in museum gift shops as a living reminder of the pinnacle of human stupidity. (WHY DO YOU NEED HAND TO HAND WEAPONS WHEN YOU HAVE LAZORS?!) Because the cloud people are incorporeal, the swords are completely harmless and they allow their young to play with them.