The World of Warcraft expansion expands to resist the invasive corruption of the Burning Legion in the game's first retail add-on package. The Dark Portal is reopened, and it is left to the greatest heroes of the Horde and the Alliance to rise up and meet the soulless scourge in its otherworldly garrisons, lest they face it once again in their troubled homelands of Azeroth.<br><br>Two new races arrive with the Burning Crusade expansion. The fair Blood Elves, doomed descendants of the High Elves who fought alongside humans against Orcs generations earlier, join the Horde. The bulky Draenei, a refugee people that managed to resist the Legion's demonic corruption, have fled their world and joined the Alliance of Azeroth. Blood Elves may become Paladins, and Draenei may become Shaman, opening these classes to their respective factions for the first time.<br><br>Seven surreal outland regions are added by the Burning Crusade expansion. Only the most veteran heroes of the Horde and the Alliance will be powerful enough to confront the Eredar, Gronn, and other corrupt creatures that rule there. The new "Caverns of Time" battlegrounds allow players to fight in crucial conflicts from WarCraft real-time strategy lore.<br><br>The expansion adds dozens of monsters and hundreds of quests, raises the level cap to 70, and brings flying mounts for the mightiest of the mighty. An additional profession, jewelry, is introduced. High-level spells and talents are added, and new equipment becomes available, including socketed items to be enhanced with jewels.<br><br>A full installation of the main World of Warcraft game is required to play the add-on. While some of the expansion's new content is available to all existing World of Warcraft players, those who wish to visit the Outland or create characters of the new races must install The Burning Crusade.See pictures for grading.