You walk into the room and it is like stepping into the grand library. Wall to wall and floor to ceiling is taken up by leather bound loaded bookshelves. All of the tomes are in varying states of decay and none of which are new.
What if some crazy wizard created an artifact that empowered rodents that touched it with one random supernatural power? Preferly right out of the pages of your favorite four-color. (But only one power!) This item does not convey any sort of intelligence boost.