At some point between 15 ABY and 25 ABY Ben Solo constructed his lightsaber while training as a Jedi Padawan under his uncle, the Jedi Master Luke Skywalker, as was the tradition of the Jedi Order. After Solo fell to the dark side of the Force and adopted the name of Kylo Ren, master of the Knights of Ren, he continued to use the same weapon, modifying it to suit his new preferences as a dark Force-user. The modified crossguard lightsaber would serve as his weapon throughout his time as the dark apprentice of Supreme Leader Snoke, as well as afterward as Snoke’s successor.