once youve collected everything (Phial of Blood, Dragon Scales and the book) you go into the altar area, and with the book you received from the Librarian you combine the 3 items to create a spell to turn the dragon into a man and then kill him. to start the quest for the book go down below under the librarian and theirs a text which you cant read so ask the librarian about it and he gives you a book on how to read it the rest should play out from their.
