When the Guardians of the Universe discovered that Sinestro, the Green Lantern of Sector 1417, had used his ring to take control of his homeworld of Korugar, the Guardians expelled Sinestro from the Green Lantern Corps and banished him to the planet Qward in the Antimatter Universe. On Qward, Sinestro met the Weaponers of Qward, and told them of the Yellow impurity, how the Green Lantern Rings could not affect anything colored yellow. Having been working on a weapon similar to the power rings for several millennia, the Weaponers of Qward developed the Yellow Power Ring, designed to project yellow energy and and take advantage of the Green Lanterns weakness.