Of what did Ender dream, and what was the significance of the dream ? Towards the end of the book.

Ender's dreams are strange. He dreams of Fairyland and the dead giant

He also dreams about fighting Bonzo. He kills Bonzo in the dream which is actually what happened anyway. I think all of Ender's conflicts are swirling around his brain. In those conflicts there is a kind of finality which represents the finality of this final battle.