Corons Maze

A maze of bookshelves fill a 30ft square in an area you can see. This area now becomes difficult terrain. If a creature enters the maze, it must make a Dex save of 15or takes 3D6. On a save it takes no damage, but can still only move at 1/2 speed. 

at higher levels of 5 and above, you add 1D6 per increase of spell level.