This is Kylo Ren's Lightsaber from Star Wars The Force Awakens. This Lightsaber has a very intimidating and unstable blade cause by a cracked Kyber Crystal inside. Kylo Ren crudely built his lightsaber with a crossguard based on a very ancient design dating back thousands of years to the Great Scourge of Malachor. In the movie, Kylo Ren wielded this powerful saber as he spreads terror throughout the galaxy with the First Order.