The Second Night's Final Dream

Be warned, this one was, to say the least, extremely long:

The fourth dream I had, I was Harry Potter again and for some reason or another we had to find a book that was in another school, we had to travel through a warp gate into their library to get it. It would have seemed easy enough but it was impossible to breath through the gate.
I got on a broom and Luna got on as well because she knew what the book looked like. We flew into the gate, once we had passed the gate there was a huge library, totally black and white, with no ground beneath us, and what appeared to be black sparks or tiny balls of ash were slowly moving towards us one at a time, not causing any damage or concern when they touched us. Holding our breath we slowly approached the book, it seemed everything was slowed in this place, and we almost made it to the book when I ran out of breath and had to turn around; once I made back out of the gate and calmed down we got back on the broom and tried again. We made it around half the distance we had before when we had to turn around again. We did this a few times but never got any closer to the book, in fact, each time we seemed further away than the last.
Then, outside of the gate, someone mentioned that Luna was part vampire so she could breathe inside the gate. I hadn't noticed her, she had been sitting behind me, I thought she was holding her breath just like me. At this point I felt as if I had let her down. Just then I realized something, I went into my inventory and saw the Zora Armour (from The Legend of Zelda for some reason) so I walked out of the room and put it on. Once I was changed I came back into the room and explained that if this armour could make me breath underwater, then it could undoubtedly make me breathe through the warp gate.
So, we got on the broom once again. (I had the invisibility cloak in my bag, just in case anything went wrong) After entering the warp gate we were slower than before for some reason, perhaps it was just that I was tired from prior trips. We made it to the book and I reached out for it and everything went dark.

The next thing I knew, Neville, Luna and I were all under the invisibility cloak in what looked like a much darker version of Hogwarts. The walls seemed to be pitch black with only a few specks of any lighter colours as did the pillars around the room. We headed into to their equivalent Great Hall, where everyone was sitting around tables very similar to those at Hogwarts (only these tables where black, surprise, surprise).
We looked around and I recognized one of the teachers as someone who was obviously an old teacher from Hogwarts, by the way Luna and Neville spoke about her. I remembered that she wasn't a particularly nasty teacher or a particularly nice one; she looked a lot like a strange cross between Professor Umbridge and Professor McGonagall (but of course, wearing black) light grey hair and didn't seem to be paying any attention to anything or anyone, just staring into nothing, possibly in deep thought or possibly daydreaming.

We decided to leave the Great Hall and make our way outside. By now we were at the front of the hall, which was an identical version of the furthest end of the Great Hall in Hogwarts, the only difference being, the people sat at the chairs, and, of course, the obvious lack of any colour.
We walked over to the other side, hoping to sneak to down the side without being noticed when a very tall boy (seemingly a student) was making a speech about greatness when he turned to me and said
'You're great aren't you?'
Desperately hoping he hadn't seen us I shushed him as I quickly moved past him, after turning around I realized he had stayed staring at the spot where I had been standing, which was, to say the least, a relief. After realizing that he boy had not seen us I also realized something else, I realized there was no more 'us' it was just me! I was the only one under the cloak! I looked around franticly hoping to see them hidden somewhere or being carried of by some students, in which case they could be rescued, but no, they were not anywhere to be seen!

I made it out of the Great Hall with more speed than was really safe considering the situation and found myself outside, confused and more than a little bit worried, I ran to the door opposite and opened it. I found myself in a smaller library than before; I was warned that through the warp gate things might seem bigger and more dangerous, so this must have been the actual library, a small room with only a few shelves and a few tables, all still black. I thought I was the only one there until I turned around and noticed that the Professor I had recognized in the Great Hall was sitting at a table with small square specks around her regular sized nose reading some papers with a large amount of books in front of her (there are very few people in this world with regular sized noses so that seemed an important point to mention)
I walked over to her and sat down next to her, for some reason or another, and she spoke to me
'I know what you are looking for' she said in a mysterious tone
I just sat and looked at her, wondering if she really did know what I was looking for and how she knew where I was.
She handed me a piece of paper
'The 8th year head (they either had an extra year or numbered their years differently), died recently, he was reading a large number of books and writing out what he had read, they say he finished writing out five of them, she said as she handed my the piece of paper she was reading.

I looked at it and saw that there were to sections to the page, the first contained a title and three pictures on either side, seemingly pictures of the covers of the books that he had been reading, the pictures did not move, as most pictures in this world did, which by now seemed more eerie than the moving ones. In between these pictures was a large chunk or writing which I, of course ignored. Then there was a long line of writing, bigger than the rest, which seemed to separate the two parts of the page.
On the bottom of the page were another three pictures on each side and a similar chunk or writing in the middle. I looked up at the Professor and she signalled with her head that I should look at the page again. I started looking at the pictures (anything to avoid all of that reading, it didn't exactly seem like a fun chunk of writing, clearly a very serious view was what was meant to be put across)
I started with the pictures at the bottom for one reason or another and didn't see anything of interest. I looked up at the Professor again and once again she signalled for me to look at the rest. I looked at the top half of the paper this time. After a few seconds of examining it I realized that the picture in the middle of the second row was the book we had been looking for only with a different cover, this one had a strange looking man, dressed in black with no colour in his skin and a strange, flat, gel covered haircut that seemed to be almost glowing. Only his top half was visible as he was standing over the title of the book reaching for it.
This, in comparison with the other book, the one through the warp gate, which was simply a black book with the title written in gold seemed like a very amateur interpretation, perhaps an earlier version, but definitely the same book.

I looked up at the Professor, astonished and she looked back and nodded. She pointed at one the books, one in the middle of the pile and I reached out to take it from the pile, I looked back at her to check if it was okay and she nodded and I pulled it out from the pile, being careful not to let any other books fall. As I turned around to walk out,
'You might want this' she said as she through me the invisibility cloak. I nodded my thanks and threw it over myself as I left the room with the book in hand.

I looked around for a while and found myself in another corridor, once again pitch black and very empty; there were about three doors on each wall, each with a window next to it. And next to the doors opposite where I was standing was another corridor, undoubtedly leading to more doors and more rooms. I ran around the corner into the next corridor and saw a large door with an engraving above it. Unfortunately this engraving was too high to read but I thought this must be an important room so I slowly opened the door, very quietly, just enough to sneak in.
I saw that Neville and Luna were both being questioned by a woman sitting behind a large desk. She hand long black hair and a cruel look on her face, undoubtedly amplified, if not created by her dark surroundings.
She stared at Neville and Luna who both looked horrified and rooted to the spot as she stood up and began walking over to them. I made my way in through the door and noticed two more corridors, without any doors to close them off, on opposite sides of the room. I knew I had to help Neville and Luna so I want into the corridor closest to them, pulled out my wand and whispered
'Stupefy'
A bolt of red light shot out of my wand and into the corridor opposite. I ran out of the corridor I was in and back into the room I started in. The woman ran down the corridor she had seen the red light come from and left Neville and Luna staring, half happy and half afraid of what would come next.
I walked over to them and threw the cloak over them, I saw them both relax as they understood what was going on and then I woke up!