Harry had entered the Dream Realm more than once.
But he had always entered with his mind, rather than his physical body.
Although it was indeed possible to enter the Dream Realm physically, it was a little more difficult. Besides, as Dumbledore had said, it was absolutely not a good place to hide anything.
Because of the Dream Realm's peculiar nature, the matter and creatures within it could transform at any moment. The last time Harry had gone there, for instance, a tree right in front of him had turned straight into a McGonagall Bird.
In the Dream Realm, things like that happened constantly.
The advantage of hiding something here was that other people would have a hard time finding it.
The disadvantage was that you probably would not be able to find it yourself, either.
Magic's effects were also greatly weakened within the Dream Realm. That made using it to find things difficult as well.
Harry had actually thought of another possibility here.
Could Voldemort have used the Dream Realm to enter a dream, then hidden a Horcrux inside it?
But he soon decided that was impossible.
You could enter the Dream Realm physically, but not a dream. To enter a dream, you had to be in spirit form, let alone bring physical objects with you.
Yet Harry still could not help having that thought.
The reason was the pyramid he had seen but could not enter after driving off the unidentified wizard who had attacked him in his dream.
Harry had a feeling that there was something very unusual about that pyramid.
But afterward, he had tried entering his own dreams to search for it and had found no trace of it at all.
He had even tried a clever trick, entering his own dream through the Dream