Mage's Encyclopedia

Midir Dag, a tavern owner who is nearly 40 years old, has been studying as a planeswalker's retinue and traveling on the mainland since he was a child. He recorded in his notes the research and knowledge he gained from his teacher and his own travels over the past few decades. This notebook was told by the elderly White Dragon that it might be the key to surviving the Dark Ages. So various forces gathered in this small tavern and collided with various stories surrounding this book (actually several boxes) called "The Encyclopedia of Mages". The dark ages are coming. Can this simple encyclopedia protect the people on this continent through the most difficult times?