I am an egg that contains a palace, or rather, I am a palace that has been contained in an egg.
In any case, I am an underworld marvel made into a miniature so that I can travel to the upper world.
He who has the magic to turn me back into a palace will be able to enter it in the upper world, and take from it what he needs to serve the mistress of the palace.
That is all I can say. To say anything more would be to give my secrets away!
Magic Egg in The Norka, Russian Fairy Tales Collected by W.R.S. Ralston. Egg by Faberge.