Harry had just woken up from a dream in which Dudley, Draco, and Theo were being held hostage by Quirrell. They were dragged down the trapdoor on the third floor after Quirrell resorted to killing the Cerberus there. He woke up before they went through the trapdoor, another consistent feature of these dreams.
Deciding to check up on his friends, he called out all three of their names while tapping the ring. The voice he got back was Quirrells.
"I have watched and waited for all the pieces to line up, now I invite you to see the dominoes fall. I give you 90 minutes before I start to torture your friends." Quirrell's voice sounded in his ear three times over and disconnected before Harry could manage a response.
"Time to get everyone and stop this." Harry got dressed and noticed that his unnatural anger was rearing its ugly head.
"Maybe it will be a blessing," ,he thought as he left his bedroom.
On his way to the third floor, Harry woke Ron, Hermione, and Neville up by using their rings, and met them all outside the corridor. Ron had brought Fred and George with him. Being thankful for the added collective experience, Harry nodded at them and as a group they all ventured towards the door containing the Cerberus. Seeing that it was indeed dead by decapitation - possibly an overpowered diffindo - Harry found himself thinking. Gathering around the Trapdoor, the six students all dropped down one by one. When Neville, the last of them, had dropped, they became aware of the danger of their current predicament. Giant black vines were wriggling around them. Fred, having been the first to drop, was half buried in them already.
"This is Devil's Snare, now as long as we're all calm it won't pose a threat. Just don't panic and make sure you're not moving, basically play dead," Neville informed the group as the vines spread and moments later he fell through. Followed by Hermione, Fred, Harry, George and then Ron, the last of which required some additional coaching.
The next room was a giant expanse, like a cave empty of all but smoke, yet the feeling of the room was unexplainable. They were crossing the giant room when, after a minute or two of breathing these fumes, everything went dark around Harry, and indeed the others. Harry panicked a little, dropping slowly to his hands and knees and crawling forwards, hoping the smoke wasn't also impacting his sense of direction. After many moments passed, and everything was still dark, the group was getting worried. That was until one of them had left the smoke and called out.
"Don't panic, I've made it across the room. I can see you all and you're all doing great," Fred called out reassuringly and with confidence and then continued saying a bunch of random things to give people a clear idea of which direction to move in, something that Harry was grateful for. As more people made it across they added to the noise Fred was making to help the rest across. When they were all safely across, and their vision was restored, they entered a room that seemed to go on up forever, it looked like it was artificially carved, as evidenced by a lack of jagged surfaces on the rocks. In this room there were a bunch of flying things, a broom, and a big locked door.
Upon further observation Harry noticed they were keys and informed the group of this. After a minute of studying them, Hermione was able to notice a much larger key and made her guess.
"The large rusty key looks like it will fit the lock." She looked excited to help solve the puzzle. Just as Harry was about to mount the broom, George walked over to the door and inserted an item into it, which he wiggled around a little bit, and the door opened.
"Lockpicks. Very useful equipment." He grinned at the shocked looks on all of their faces, except his twin's of course, and continued.
"If it requires a key I can open it."
They entered into the next room to see a Giant Chessboard. Ron's face split into a grin as he proudly declared.
"I can get us through this."
With that declaration they began the game and immediately saw that this was no joke, when a pawn smashed another into rubble.
They had just finished the game of chess and Ron had taken a hit by the Queen to allow Harry to take the king. They saw he wasn't dead, just injured, and Hermione volunteered to stay with him.
"You two know more magic than I do and all three of you are better wizards than I. Sure I can remember books and research, but you guys have actually made your own spells. Now hurry up you don't have the time."
The three rushed off at that through a long corridor that snaked down. Sinking further into Hogwarts Castle the smell was the first thing to hit them.
The hallway opened up and the smell of sewage and rubbish led straight to a giant mountain troll, it's throat was also cut. However, as it was a troll, its skin was already showing signs of stitching itself back together. Quirrell must have been in a rush to have been so sloppy as to not fully decapitate the troll.
They hurried past it without incident, the only comment by Harry who joked.
"I didn't know Crabbe Sr was down here."
Their laughter was cut short by fire spreading around them when they approached a table full of vials.
After figuring out the puzzle, Harry had come to a realisation. He wasn't the only one to realise it as both Fred and George both wore matching grim looks.
"I have to go forward alone, this room won't allow more than a single person forth. Go back to help Ron and Hermione, I'll be fine.
"You've got it Harry… don't die." Both twins said before turning and heading back to leave and get help.
"Here goes nothing."
He walked towards the far side of the room towards an archway leaving to a big square room with The Mirror of Erised, his friends, and a very amused looking Quirrell.
"I was beginning to worry you weren't coming, Harry. Ninety two minutes have passed and I'm afraid I don't like lateness. Mr Malfoy here was more than happy to learn a reminder of how far my patience goes." He smiled at Harry with a very predatory look upon his face. Harry walked over and put himself in between Quirrell and his friends.
"I promise you, Quirrell, if you hurt any of them again, I will kill you, though I'll probably have to kill you anyway as the only way you're getting to them is through me and I'm not going anywhere." The near ever present rage always within Harry had burst forth and for once he had a noticeable aura of power around him.
"Ah, so this is the power of the one who 'killed' the Dark Lord? Perhaps if I hadn't met the most powerful wizard of all time it would be more impressive. Now, Potter, you can choose to join me or you can die, as will your friends, if you pick that road. "
"Why would I join a mediocre Defence teacher? I mean in the grand scheme of things, what importance do you really have?" Harry taunted back, but to his surprise Quirrell laughed darkly.
"I am much more significant than you think, history will remember the name Quirinus Quirrell. You see, I was personally chosen to hold a great honour." Quirrell turned around at this and Harry's scar immediately started to hurt. Not the intense vomit inducing pain of before, but still worse than the worst migraine. When Harry could open his eyes, Quirrell was in the process of removing his turban, when a face appeared on the back of Quirrell's head. It was grotesque, a thousand times more disgusting and hideous than a corpse and yet infinitely more menacing. With bright red eyes and a rotten gash where a mouth should be. Harry was horrified, this was almost enough to make him sick, poor Draco wasn't lucky enough; even more unlucky was Theo who unfortunately, was in the splash zone.
"We won't need witnesses to this." He stunned the three bound Slytherins and looked back into Harry's eyes, only making the pain worse.
"You see what I've become, what I've been forced to do. I have gone further than any in my pursuit of immortality and yet you, a mere infant, were able to reduce me to less than a Poltergeist, less than even the smallest sliver of a soul. That doesn't matter anymore, Harry, because I have you here now. You can get the Stone for me and we can talk to your parents and bring me back to a full body." He dragged Harry over to the Mirror and he saw himself drop the Stone into his pocket and wink.
"I need to find out how to get the Stone out. It shouldn't be this difficult, but for some reason I can't get it."
"All I can see in the Mirror is you leaving Quirrell's body and him dropping dead." Harry said with rage flavouring his words. "He leaves you and flies away and vanishes into nothingness. But if this is just my deepest hopes and dreams, then how is it any way relevant?" Harry stared deep into the Mirror and he could see his eyes glowing red in the fires burning around him, he could then see himself as an older and more powerful wizard. He saw death and she was beautiful, he saw life and she was equally beautiful. He saw choices that would come, others that wouldn't. He saw the many people he could become, all coming and going in flashes. Just as it was all becoming too much for Harry, the mirror exploded into dust. Harry had no idea what had caused it to happen, and clearly neither did Voldemort. That didn't stop the latter from laughing and smiling at Harry.
"Your anger is powerful, I can see that very clearly, you will become my apprentice and we will be unstoppable. You're already my Heir, as dictated by your scar, you need only walk out of here with me. You see, Harry, I knew the Stone was a waste of time, of course it couldn't restore me to a body. You were my target, we are destined to rule together." Voldemort had the sickest expression of glee carved into his face.
"Why did you say we could talk to my parents? You knew the Stone was a dud, why give me hope for something that even the great Lord Voldemort cannot achieve?" Harry's anger was making his Aura noticeably darker, this was the man who killed his parents, the man who effectively sent him to Wool's. He aimed his wand at Quirrell-Mort and sent all of his anger down his wand and shattered both of Quirrell's knees.
"Harry, killing this host won't hurt me. I will just remove myself from him and leave here. I'm giving you the choice to come with me and become a God, don't throw it all away for your childish sense of right or wrong. We must leave now, there will be enough time for our conversation later." The smile was still there, but was slowly fading as the seconds ticked by.
"You will still have to leave him, he can't walk with broken legs. How would we get out of here?" Harry responded, half stalling for time and half considering it, his unnatural anger becoming overwhelming.
"You insolent little brat, my Lord wouldn't leave me here in our moment of triumph." Quirrell boasted and the look on Voldemort's face became viciously angry and, if possible, even more hideous.
"How dare you talk for me, you miserable excuse for a wizard, do you claim to be Lord Voldemort just because you host my spirit?"
"No, my Lord. I apologise for my- my Lord, I beg of you, stop this." Smoke started to rise around Quirrell and with it his face began to melt. After a minute his eyes burst as did his tongue, the blood coalescing around his now prone form. While he stared at the mangled mess in horror, unable to remove his eyes, he was completely ignorant to the smoke gathering together to form a face. Said smokey face flew towards his face and poured into his scar, Harry screamed like never before as his vision went red then black and he fell to the floor unmoving.
Mere minutes later Professors Dumbledore, Snape, Flitwick, and Mcgonagall all burst into the room, wands drawn, before observing the scene in front of them in shock and horror. Even the usually stoic Professor Snape was visibly shocked at what he saw.
They unbound and revived the stunned students before they rushed to try the same on Harry. Nothing happened. They decided to carry Harry to the Hospital Wing immediately to allow Madame Pomfrey to heal him.