Hybur Lightsaber Crystal

A Hybur Crystal was an insanely rare lightsaber color crystal that was to much for a normal jedi or sith to use. Only Sith like Darth Sidious and Jedi like Mace Windu could withstand the negative effects to the murderlously strong crystal. All crystals have some sort of power, but they all had one power in common: the power invert 3D dimensions. Whenever used around people not strong enough in the force, it could invert the 3rd dimension to the 2nd dimensions; only 40 feet in circumfrence whould it be the 2nd dimesnion, with the crystal being the centre point of the cicle. Since no widely known Jedi or Sith had a Hybur Crystal during the Rise of the Empire era, creatures who lived around it started destroying it, (those creatures never allowed non-force connected items in their presence) but a Dark Jedi quickly killed those creatues.

Color
Hybur Color Crystals had a Azure-Blue core, with a black outline.

Other Uses
Hybur Crystals could be used to replace the other crystal of the lightsaber, but due to the shortage, most Jedi or Sith just got the other crystal instead; finding one crystal is like making 3 lightsabers at a time.