The "Supreme Being" was a creature created by the zerg on Char through the use of the xel'naga artifact, the Argus Stone. It reached maturity within a chrysalis. Xel'naga lore predicted that a catastrophic war would precede the birth of the legendary being, and only one race would emerge triumphant. Terran and protoss forces, which had been seeking the Argus Stone, attempted to destroy its chrysalis, but were defeated by zerg forces.