When the Guardians of the Universe discovered that Sinestro, the Green Lantern of Space Sector 1417, had used his Green Lantern Power Ring to take control of his home world of Korugar, the Guardians of the Universe expelled Sinestro from the Green Lantern Corps and banished him to the planet Qward in the Anti Matter Universe. OnQward, Sinestro met The Weaponer and the Weaponers of Qward, and told them of theYellow Impurity, how the Green Lantern Power Rings could not affect anything colored Yellow. Having been working on a weapon similar to the power rings for several millennia,The Weaponer and the rest of the Weaponers of Qward developed the Yellow Lantern Power Ring, designed to project Yellow Energy and take advantage of the Green Lanterns weakness. With the establishment of the Sinestr