Chakra Blade

A is a weapon made from special metal that absorbs the user's chakra characteristics and exhibits power based on the user's technique. Asuma Sarutobi, Sora, and Shikamaru Nara use techniques that require the use of a chakra blades like the Flying Swallow technique and Shadow Imitation Shuriken Technique. The White Light Chakra Sabre wielded by Sakumo, and later Kakashi Hatake, also had the ability to absorb their chakra and give it off as a white streak of light whenever they swung it.

Trivia

 * Asuma taught Naruto Uzumaki the fundamentals of the wind nature with these blades during Naruto's Wind Release training.
 * In Naruto Shippūden the Movie: The Lost Tower, it was revealed that Konohagakure has a standard chakra blade that is used by some shinobi.
 * Shikamaru would eventually past down Asuma's Chakra blades to Asuma's daughter Mirai Sarutobi, shortly after she was promoted to Chūnin.

Cuchillas de Chakra