Advanced Black-Yellow Fortitude Crystal

Advanced Black-Yellow Fortitude Crystal is an artifact color crystal modification that can be added to a player's custom weapon.

Source
Advanced Black-Yellow Fortitude Crystal is mailed to players that pre-ordered Star Wars: The Old Republic. It can also be purchased for credit 10 from the Pre-Order Crystal Vendors on the Imperial and Republic Fleets.

Related articles

 * Yellow Fortitude Crystal