Cyril is going to get his personal copies of Varric Tethras' books. He has all of them back home in his Kirkwall manor. These copies have also been signed with a personal message to him from the author. The collection would include all of the books Varric has written up to All of this Shit is Weird: The Inquisitor Lavellan Story - which stars Cyril himself as Inquisitor. Notably, though, Tale of the Champion would be missing. I just don't want to deal with introducing another more different Hawke's story to the game so that will be the only book of the collection that would somehow mysteriously not make the trip.