Look at this cute little book worm, what could possible happen? Maybe nothing,
But if we turn to the Monstrous Compendium Volume One, we can see what can happen. They are a rare monster that can be found anywhere. They come in groups of 10-40 and they eat thought magic scrolls at a speed of 1 spell level per round.
That is about it, so attacks or anything like that. I am still going to use some of the things in this monster to make the second draft of my Book Worm monster that can eat creatures that might come in to its liar.