Described by Sony as an "unparalleled" expansion for the franchise, the Underfoot add-on sells for $39.99 on the game's official site and other digital distribution outlets, packing all the content of the previous fifteen expansions plus new areas, items, abilities and the like, along with a new achievement system, an "extended target window," and master tradeskilling.

"Celebrating a decade of EverQuest throughout this year has reinvigorated our community and development team alike, and that passion is clearly on display with the latest expansion," boasted producer Thom Terrazas. "Underfoot presents a world unlike anything you've experienced in Norrath, providing a deep and fun experience."

In addition, any player "with an active, paid subscription in good standing" will gain free access to EQPlayers.com beginning December 17, with Sony claiming that the move is meant to "further demonstrate SOE's commitment to its player community."

For a breakdown of what's included in Underfoot, here's the fact sheet:

About EverQuest Underfoot:

New Content: New areas for adventurers to explore including Brell's Rest, Pellucid Grotto, The Underquarry, Brell's Arena, The Foundation, The Cooling Chamber, Arthicrex, Lichen Creep, Kernagir the Shining City, Fungal Forest, Volska's Husk, and Brell's Temple. Players can travel into Underfoot solo, with a group, or in raids to complete new quests, tasks, and events to acquire new items, spells, tradeskill recipes, and abilities.

New Achievement System: Users can display and manage their progress through the world of Norrath. The achievement system allows players to track various categories of their advancement such as levels, Alternate Advancements, quest completions, and other progression tracking events. At the launch of Underfoot, players can track their General, Tradeskill and Underfoot progression Achievements.

Extended Target Window: Players can now track friends and foes with greater accuracy. The target window now lets players assign people or group roles to specific locations on the window for easy re-targeting. Users can track main tank, raid tanks, main target, main assist, puller, etc., or just put a specific player or NPC in the window.

Master Tradeskilling: Tradeskillers can create powerful new weapons, armor, food and drink items, poisons and more.