This quest is given from George Gremory. You must find someone who can translate ancient Draconian.
Find and locate Zixzax (his location is on the map to the right) to translate the ruins, then return to George.
When you ask him to look at the book, he will summon a level 13 demon on accident. Kill it, then talk to George again to finish the quest.
Save immediately after the demon dies but before you talk to George, that way you can load until you get an item you want. You can pick some very good items.
The default reward is 2200 exp, 360 gold, and one choice from three random legendary items.