During the war of chaos, the gaurdians gatherd the light. Energy and matter, wielded through base-emotions. They knew the light had many forms, but the gaurdians chose will as base for their power rings, and the green lantern corp was born. But when a rogue lantern, Sinestro, thought fear would be a more worthy power, their was war. Out of this war, would form several other corps, Sinestro's being the Yellow corp.