Black onk

"A simple grip? A curved approach? One inlaid with the bone of the Cartusion whale, pastillion ore or black onk?"

- The options given for lightsaber design by Huyang

Black onk was a substance that could be used in the inlay of Lightsaber handles. The Architect droid Huyang told a group of Jedi Younglings aboard the Crucible that a black onk-infused handle was an option in the process of building their lightsaber.