The words are THE END OF THE WORLD. This cavern is in a fantasy world where recruits play games. After Ender enters the cavern, he finds a forest scene. In this new place, he can do things without fear of harm such as jumping from a cliff and landing on a cloud. The cloud takes him to a room with a fireplace. Before the fireplace on a small rug lies a serpent who says, "I am your only escape. Death is your only escape." At the end of the book, you will find out the significance of this scene. Ender will visit this same fantasy world many times. He will begin to piece together its significance though total understanding comes after the bugger war ends.