Oa is a planet that lies in the center of the universe and occupied to a race of blue-skinned powerful humanoids who have dubbed themselves the Guardians of the Universe and Home of the Green Lantern Corps.
Ysmault is the home planet of the Red Lanterns. Located deep in the forgotten sector, the name being a sad title given after the manhunter's attacked the planet and they called for aide, The Guardians not answering the call.
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