When he wasn't researching spells, Harry would find ways to sneak into the out-of-order bathroom where the entrance to the Chamber of Secrets was located so that he could study the spells that hid and sealed the entrance. Unlike the other spell traps he'd removed in the past, the ones surrounding the entrance into the Chamber of Secrets were very old and very complicated; which was why it took him multiple trips to work through the tangle of wards and spells even with the help of his Trapping Skills. The limited time he had to study the entrance each time he snuck away didn't help matter either.
Once he was confident that he could open the entrance, Harry made plans to enter the Chamber after the End-of-Year Exams like he had with the Dungeon up on the third floor the previous year. A double attack on May fourth pushed his plans up by a month when Ronald Weasley had been petrified and a girl had been kidnapped by the perpetrator. Harry still would have waited except that he'd learned from Fred and George that it had been their little sister, Ginny Weasley (whom Harry had never personally met despite the fact that she'd also been sorted into Gryffindor at the start of the year), that had been taken.
Harry had immediately used his SAO Skills to slip out of the Gryffindor Tower so he could open the entrance to the Chamber and go after the girl. It was obvious to him that saving her was a required quest to move onto the next segment of the game since she was the sister of two NPCs he that interacted with fairly regularly. The twins had somehow managed to follow him and demanded that he take them with him right up until Lockhart had stumbled upon the three of them just outside of Moaning Myrtle's bathroom.
The incompetent boob had then attempted to Obliviate the three of them so that he could steal the credit for finding the entrance to the fabled Chamber of Secrets once he had learned why they were out of their common room unsupervised. Fred and George had quickly taken the fraud down using an assortment of prank spells and prank items that they'd invented while Harry stripped away the last of the spells blocking the Chamber Entrance.
Leaving the twins to guard their prisoner and inform a more trustworthy professor about the man's attempted attack, Harry dropped down into the tunnel leading into the Dungeon with Hedwig gliding down after him. The twelve year old soon found himself on a huge pile of bones; most of which he recognized as the bones of various rodents, Red Caps, a couple of unidentified creatures, and the exoskeletons of dead Acromantula. Wrinkling his nose in disgust, Harry crossed the bone pile and followed the fading tracks of his adversary; picking up the discarded shed of a Basilisk (according to the Item's description) along the way.
Sadly, a Basilisk was one creature that had not been on Hermione's list of potential monsters; it hadn't seemed to fit the profile of the attacking monster (since Harry had never heard 'voices' moving through the halls prior to each attack and he had never been ousted as a parselmouth – due to him losing that borrowed ability) and because the dead rooster had still not been linked to the attacks.
Hedwig landed on his shoulder when he came up to a second sealed door, the occamy mildly distressed over their current location deep beneath the bowels of the castle. Harry let her stay despite the fact that she had grown enough over the last year and a half that she was fast approaching the point where she would be too heavy for him to carry because unlike his familiar, he had not grown; not even a fraction of an inch (a side effect of his body being trapped in a magical stasis for almost two years but Harry still saw it as proof that he was trapped within a game). It took him nearly an hour to unravel the spells sealing the inner door and Harry figured it either held a Boss Monster or the Basilisk.
He soon discovered it held both.
He'd entered what he soon learned was the fabled Chamber of Secrets (and not the first chamber in a series of Dungeons leading up to the Chamber as he'd originally expected) to find Ginny Weasley laid out at the foot of a statue of an ugly looking man with monkeyish features with an older teen hovering over her. Harry had been more than a little confused about who the teen was and why he was there until the older boy revealed that he'd manipulated Ginny into attacking the students all year long. He'd also revealed himself to be an incarnation of Voldemort.
The next two hours had pitted Harry and Hedwig against the memory of a young Voldemort (whose true name was Tom Marvolo Riddle) who continuously fired an assortment of dark spells at him (including the Killing Curse) and Tentatio the Basilisk. At the same time, the teen had seen fit to boast about how he was a memory preserved in a diary, how he had ended up with Ginny Weasley, how he had been using Ginny all year long, and how he was going to take over the world once he'd killed Harry.
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