Mosaic World
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In the DC Comics Universe the Mosaic World was a group of communities from different planets that were drawn to the planet Oa by the insane Guardian of the Universe, Appa Ali Apsa. The patchwork communities were kept on Oa by the Guardians of the Universe and guarded by the Green Lantern John Stewart. Initially distrustful of each other, the various communities of Mosaic World were eventually forged into a cohesive society through Stewart's efforts. In return for his success, the Guardians granted Stewart the honor of becoming the first mortal Guardian. The story of the Mosaic World was chronicled largely in the series Green Lantern: Mosaic.
The Mosaic World was evacuated after Hal Jordan, possessed by the Parallax entity, destroyed the Central Power Battery and slew all but one of the Guardians of the Universe. Its abandoned remains were finally destroyed when Oa was obliterated by Kyle Rayner during a battle with Jordan.