The leveling experience is drastically changing in WoW Shadowlands. Not only is the new max level being crunched down to 60, the entire experience from 1 - 50 will be customizable.
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World of Warcraft: Shadowlands impressions: Leveling alts is about
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WoW Shadowlands Threads of Fate: Is it Faster? - XP, Quests, Bugs
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How you'll level alts in WoW Shadowlands
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250 Character LvL 60 Alt Army Challenge Update!