Jar'Kai is a method of utilizing two lightsabers in combat, with notable users being Asajj Ventress and Ahsoka Tano; Darth Maul used Jar'Kai, and even Darth Sidious was proficient in this style, using primary and backup weapons against Maul and Savage Opress. Defense is added with a second blade, allowing one to attack without exposing oneself; another traditional tactic is use both on a continuously strong offense. The con? Lack of power, as one would be limited by fighting one-handed, meaning one cannot perform power swings.
Kylo Ren, by Erik DeAvila.