Qward
Qward is a fictional world existing within an antimatter universe that is part of the DC Comics Universe. It was first mentioned in Green Lantern (vol. 2) # 2 (October 1960).
Fictional history
Qward was created when Krona, an Oan scientist from the planet Maltus, performed a forbidden experiment to try to see the origin of the universe. Somehow, this disrupted the process of cosmic creation, resulting in an additional, opposite universe. Qward is that universe's counterpart to Oa.
Qward was ruled by their universe's version of the Monitor (that would come to be called the Anti-Monitor by Earth's heroes). It was this entity that created the organization of warriors known as The Weaponers of Qward within the race known as Qwardians. The Qwardians are antimatter counterparts to the Guardians of the Universe. Although the Anti-Monitor was defeated and imprisoned by his counterpart from the positive universe, the Weaponers themselves continued to rule their world. In one of the earliest JLA/JSA crossovers a being from the antimatter Universe, called Anti-Matter Man, appeared, who was an explorer who was travelling through warp-space towards Earth-1 and 2, apparently not aware that contact with them would make them blow up. This being was tens of metres high with blue skin and had some resistance to magic, along with strange powers which could warp positive-matter. He was sent back to his Universe using shock-waves caused by the Spectre and Atom.