Complete the following levels to unlock the corresponding secret book:
LEVEL - BOOK Attack at Cedarleaf - Zhai's Past The Wizard's Tower - Khelben's Letter The Jungles of Chult - Illius' Youth The Yuan-Ti Temple - Nesme's Fall Stand at Mithral Hall - Cireka's Vow Drizzt's Journal Into the Underdark - Ygorl And The Dragon
The level "Into The Underdark" has unlimited experience and gold. When you reach the part of the stage with the ice barrier and wizards, switch to Zhai and use the shadows on the right side of the bridge to sneak attack enemies that appear from the right tunnel. You can do this as long as desired. Zhai steals gold from enemies when invisible. Get as many kills as you can. When satisfied, proceed to fight Cireka. Only kill the wizards that fire missiles at you. The large slow moving bombs go directly for the character you are currently playing. An unlimited number of enemies will flow from the portal. Kill them and get your characters' hero meters up. When full, use it repeatedly. You must do this at least twenty times for decent experience. The more times you do your team attack, the higher the experience multiplier at the end of the level.
Complete the following levels to unlock the corresponding pictures in the gallery:
LEVEL - PICTURE War in Damara - Battlefield Gemspark - Concept Art Attack at Cedarleaf - Cedarleaf The Wizard's Tower - Wizards Tower The Jungles of Chult - Chult Jungle The Yuan-Ti Temple - Chult Temple Stand at Mithral Hall - Mithral Into the Underdark - Githyanki Outpost The Dragon's Lair - Dragon The Lord of Chaos - Limbo
Complete the game under the hard difficulty to unlock the Red Dragon Armor for Zanek and be able to use the Silver Sword. Obtain the Red Dragon Armor by completing the tenth chapter under the Hard difficulty setting. Go into "Upgrades" and then into the armor upgrade for Zanek. It will appear directly below the mithril armor. The Silver Sword will already be equipped and cannot be upgraded.