Elemental Gate

According to Agatha, the Book of Elements was brought into the water elemental plane by a group of elves who opened the elemental gate and fled into the elemental plane a while back (Note: Never expect elemental creatures to have a good sense of time). Back then, when the elemental lords sensed the mighty power of the Book of Elements, they sealed it inside the arctic ice of the water elemental plane in order to prevent its impact on the four elemental planes. This move wasn't too surprising. After all, the fire and wind elemental planes weren't suitable for storing items, so only the earth and water elemental planes were left as their choices. And sealing items was the specialty of the water elemental plane.