Liber Artefactorum: A World of Nevermore Supplement is a set of rules for creating magical items using the True20 system, including rules and 25 items specific to Green Ronin's dream-like Nevermore setting. The Gen Con edition has a special cover. From the publisher's website:

Liber Artefactorum is a 36 page supplement containing complete rules for creating supernatural items for the True20 system, including:

• Armor, shields, and weapons
  
• Charms: single use items of particular feats or powers.
  
• Devices: items imbued with special abilities
  
• Enhancers: items that augment character by granting special abilities
  
• Foci: items that improve the welders' supernatural powers
  
• Infusions: items infused with a single use of a supernatural power
  
• Cursed Items: items that are cursed, incorrectly made, or corrupted by outside forces
  
• Intelligent Items: permanent supernatural items imbued with sentience

Liber Artefactorum also introduces specific rules for creating supernatural items in the world of Nevermore. Nevermore is an ever-changing world where reason fades into myth and imagination. Featured in Green Ronin's True 20 Worlds of Adventure, it offers a plethora of possible and even improbable adventures for those who traverse its strange domains. Nevermore amplifies and accentuates, twists and skews, it is a place where nothing remains the same for long and all who walk its lands, fey or mortal alike, are changed forever.

Liber Artefactorum contains over 25 items of Nevermore, opening the dreamscape for all who dare to venture.