Location Maxos Temple
From The Librarian (library)
Rewards XP & gold
1 additional option
Orbis Arcesso (part 2)

The Librarian ask you to return a lost book to him. It is in a chest in the chambers of Maxos Temple, which is unlocked with a key found in a hidden chamber in Amdusias' room (see Dragon No More for more info). Read the book before you return it. After you give it back to the Librarian, you will get the second part needed to defeat Amdusias.