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The Realm of Y'Shaarj is a plane named after the Old God Y'Shaarj. The Horde's Rebellion, the Alliance and their adventurers fighting the tyrannical Warchief Garrosh Hellscream, who had absorbed the power from the Heart of Y'Shaarj, gaining new, corrupt powers and abilities, were pulled into the areas of the realm by call of Y'Shaarj through the Heart.
There's a Portal to Reality in order to return from the corrupted Stormwind to the Underhold and the Rite of Corruption which is an entry to the final area.
This article or section includes speculation, observations or opinions possibly supported by lore or by Blizzard officials. It should not be taken as representing official lore.
The Realm of Y'Shaarj may be a part of the Twilight Realm.