the 16th EverQuest expansion will be called Underfoot. It's coming out in November, but you'll be able to participate in events beginning in July that will give you credit to get Underfoot before anyone else.
It will launch with 12-15 zones, with bonus zones being added through April 2010.
It will include a new achievement tracking system and double the amount of weapons of any other expansion.
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There is no level increase for EverQuest: Underfoot