Arcane Bookshelf

You create a small pocket dimension that is tied to the astral sea. You can house a number of books in this space equal to 10 times your spellcaster level. If the window is dispelled, the connection is closed and can’t be reopened for 24 hours. If the space is full, no more books will be permitted to enter the bookshelf. Any form of written text may be placed in this space, not just standard books.