I knew I could count on you. I had the utmost faith in you. This will help me recover my health. Like I promised, here's the item that may hold key to finding The Book of Ancient. Before that, though, check and make sure your etc. inventory is available for storage.

With this, you have collected all four pieces of the map. You won't be able to do anything with these in pieces, though. You mentioned Alcaster, right? Maybe he might know something about putting these together, so I think you should revisit him. Oh, and the Old Ring you have...take good care of it. It may hold the key to a very important matter.