Caliburnus

Caliburnus is a fabled and ancient lightsaber, rumored to have been created by an ancient and technologically advanced race. It is believed by some to be one of the very first lightsabers ever created. Over the millennia the weapon has been lost, found, and tampered with by numerous adventurers and possibly even Sith Lords. Legends tell of its wielders' rise to notoriety, with some legends even saying it has the power to make its wielder invincible in combat. Like other lightsabers the blade can cut through virtually anything including blast doors, given enough time.