Sek'nos Lanith's holocron

Sek'nos Lanith's holocron was a Jedi holocron, created in 32 BBY by then-Jedi Knight Sek'nos Lanith. It contains his teachings of peace and lightsaber combat, including his style. One of the only surviving Holocrons from the old Jedi Order, it has been used thousands of years by Jedi (it has been stolen by Sith who wish to learn from it as well), and is legendary for its longevity and effectiveness of the style.