Spoiler warning! This section of the article contains spoilers, or hints about the game's storyline or progression.
You might want to skip down to the next heading if you do not want facts about the game's storyline or plot revealed to you.
I'd like to cover everything else you can hold in your inventory in this chapter.
Amulet of Clarity
This trinket is an unusable quest item in the wizard story, where archwizard Horvath asks you to get it from thieves and bandits in the mana mines.
Book of Oblivion
This book is an unusable quest item in the wizard story, where archwizard Horvath asks you to fetch it from the library below the Tower of Illusion, along with the amulet of clarity.
Spellbooks (single player)
These blue-covered books are general tomes of knowledge for a wizard or conjurer to learn or improve the application of mana, in the form of spells.
Spellbooks (multi player)
Books containing spells that are used by both wizards and conjurers. Can be distinguished by their orange cover.
Wizard Spellbook (multiplayer)
Same as described above, but only usable by wizards, also with a blue colored cover.
Conjurer Spellbook (multiplayer)
Just like a wizard spellbook, only this one can be used by conjurers only. They can be distinguished by a green cover.
Warrior Spellbook (multiplayer)
Warriors aren't able to cast spells because they don't have any source of mana. On the other hand, a warrior can learn to use skills, which are obtained through a "spellbook" recognizable by their red cover.