The Secret of Kells
Pangur Ban is also a fairy of some sort.It seems possible to me, she could just be Mode Locked like Aisling near the end of the movie. She's also way too smart to just be a normal cat, there has to be some magic there.
Crom Cruach was exorcised by St. Patrick.St. Patrick drove the snakes out of Ireland and Crom Cruach is a giant one.
The book is evilEverything bad that happens can be attributed at least somewhat to the book. Brenden risks his life multiple times for the book, at least one of which was completely unnecessary (they could have sent someone armed who knew their way around for the berries). The Abbot, who's barely seen the book, does everything he can to protect Brenden. Aidan, who has written much of the book, couldn't seem to care less. Iona, where the book had been for the most time, never did much in the way of defenses. Kells had walls, but the door wasn't strong enough to hold the Vikings out. Possibly because people were working on the book, rather than on strengthening the walls, like the Abbot wanted to do. After Brendan gets the replacement crystal, he never sees Aisling again. And of course, the book was written by looking through the eye of a dark god. I'd consider that a bad sign.
The Eye of Crom Cruach bestows wisdom.Brendan certainly seems smarter after he gets it.
Aisling and Brendan met before the events of the movieIn the comic prologue that reveals Brendan and abbot Cellach's back stories. When Cellach flees from the vikings while carrying Brendan, there is a scene where he jumps into the water. in this scene baby Brendan is looking at a white fish with green eyes. since Aisling has the ability to change form and she said at some point that she was a fish or something there's no reason why the fish can't be her.