User blog comment:RoyallyBella/Official Season 6 discussion blog/@comment-24374217-20141222115634/@comment-27111026-20150114054840

I'm curious about it, too. I meant, we all know it's locked forever, and the key, which is made of the items from the Legendarium world, back to that world. So how can we unlock that book without the key? It's interesting to ask, tho'... yet I don't think any of us has the answer :P.