The Heart of the Guardian was an ancient crystal that was rediscovered on the surface of Yavin 4 by the Rodian inventor Suvam Tan some time prior to the Jedi Civil War. Possibly utilized as a lightsaber crystal by the redeemed Revan, it gave the blade of any such weapon into which it was installed a unique bronze hue and yellow core. The Heart was one of two legendary crystals that Revan possibly obtained from Tan near the end of his quest to find and destroy the Star Forge, the other being the Mantle of the Force.