I used console command "coc qasmoke" to enter the Editor Smoke Test Cell. I found a Daedric Sword named Zahkrii Do Dovahkiin in the Dragonborn Weapons Chest. It looks the same as a common Daedric Sword and the enchantment is "The sword's true power can only be unlocked by the Thuum of the Dovahkiin." I can't figure out what's the usefulness. I think it was just a test item without any specialties.