Harry gingerly stepped through the pool of slimy potion that covered the dark passage, his amusement evident as he observed the mischievous machinations of the Weasley twins. "That is quite an impressive application of sticky potion," Hermione commented, her voice tinged with a mix of awe and disapproval. "Bloody amazing, it is!" Ron exclaimed, a hint of mischief sparkling in his eyes. "Umbridge hasn't been able to remove it yet," Hermione muttered, a smirk playing at the corners of her lips. "No doubt about that," Harry replied with mild amusement, "considering the sheer number of pranks around the school. Surprising that Hogwarts is still standing, really." Hermione shot him a reproachful look as they continued their way towards the Great Hall, anticipation of breakfast drawing them forward. However, their eager anticipation was quickly replaced by a sense of dread as they entered the hall, greeted by hushed murmurs and whispers that echoed through the air. It was a familiar scene, reminiscent of the atmosphere when Professor Trelawney had been unceremoniously dismissed from her position.

Ignoring Hermione's call, Harry pushed through the crowd, his determination guiding him towards the epicenter of attention. "Harry!" Hermione's voice trailed after him, a mix of concern and annoyance evident in her tone. Finally breaking free from the throng of students, Harry's eyes widened as he took in the sight that held everyone's gaze captive. Standing atop the headmaster's desk, amidst a sea of astonished faces, was a ghostly figure of a man. Clad in green robes, he exuded an air of authority and elegance. Middle-aged and undeniably handsome, he possessed an aura that demanded attention. There was a peculiar scar on the right side of his forehead, serving as a mysterious testament to his past. "Who is it?" Ron questioned, his curiosity piqued. "I don't know! Let's get a better view," Harry replied, his determination driving him towards the side for a clearer sight.

Approaching closer towards the tables, the trio had a closer look at the enigmatic figure. Seated on the headmaster's chair, he commanded the attention of the room with an unyielding gaze. Even Snape appeared taken aback by the presence before him. "You have no right to give me commands!" Umbridge's shrill voice pierced the air, her pink cardigan a stark contrast to the seriousness of the situation. "I am the headmistress, and a silly ghost like you has no place here! I can have you removed!" The man simply regarded her, his hands calmly clasped on the desk before him. "You do not seem to understand, Madame Undersecretary. Allow me to reiterate: Hogwarts has anointed me as its headmaster in this time of need. The Ministry does not hold the power to make decisions within these hallowed walls."

"You dare!" Umbridge shrieked, her face turning an angry shade of crimson as she struggled to regain control. "I am appointed by the Minister himself! A creature such as you does not have the right to speak to me in this manner!" Her voice trembled with indignation as she took deep breaths, her anger barely contained. Fred, placing a hand on Harry's shoulder, grinned mischievously. "Amazing, isn't it?" he whispered, the thrill of rebellion evident in his voice. "Ever since he arrived, this ghost has been subtly insulting the Ministry and Umbridge, informing her that she is no longer the headmistress," George, wearing an equally mischievous grin, chimed in, "I reckon this ghost might be a long-lost relative of Peeves. They share a talent for mischief and chaos." relative of Peeves, the infamous Hogwarts poltergeist.

Before Umbridge could retort, the ghostly figure rose from his seat, his commanding presence silencing the room. "I now have all these young lads and lasses to look after. So, if you would, with all your grace, leave us," he spoke, his voice resonating with authority. His gaze, intense and unwavering, locked onto Umbridge, conveying a message beyond words. A clanging voice reverberated through the hall, akin to the sound of metal tools clashing in Harry's uncle's backyard. The students instinctively subsided as armoured knights stationed in the Hogwarts passageways strode in, two of them appearing by the entrance with unwavering strength. With sturdy arms, they swiftly lifted Umbridge from her position, dragging her out of the Great Hall as she protested and raged against her removal. "The Minister will hear about this!" she screamed, her voice echoing in the distance as the doors closed behind her.

"Now," the ghostly figure began, his voice calm and collected, his piercing gaze sweeping across the hall, "if all of you would be seated, I have some important directives to issue." In a matter of moments, the students took their places at their respective tables, Harry finding himself squeezed between Hermione and Ron, with Neville and Ginny seated across from him. Curiosity burned within him as he leaned towards Neville and Ginny, his voice laced with anticipation. "Do either of you have any idea who he is?" he inquired, eager to unravel the mystery. Both of them exchanged puzzled glances before shaking their heads. "We're not certain, Harry," Neville admitted, his voice filled with a mix of wonder and excitement. Ginny, her freckled face adorned with a mischievous grin, chimed in, "But one thing's for sure: he certainly knows how to deal with Umbridge. That's enough to earn my favor." Harry nodded, a mixture of curiosity and admiration bubbling within him as he turned his attention back to the ghostly figure before him.

"Now then," the enigmatic presence continued, his voice commanding attention and respect, "I must enlighten you all about the state of affairs at Hogwarts. For the past century, this venerable institution has suffered from grave mismanagement. Crucial magical knowledge has been neglected, and cherished magical arts have been left to wither away in the annals of forgotten history. Such a state of affairs cannot be allowed to persist." Murmurs of surprise and uncertainty rippled through the hall as the students absorbed this startling revelation.

Undeterred by the mixed reactions, the ghostly figure pressed on, his voice filled with conviction. "Hogwarts' paramount duty is to impart magical knowledge and guide its students. It is not a place for promoting political agendas or fostering discrimination. Rather, it should be a bastion of unity, a sanctuary where magic can flourish and soar to new heights. Therefore, significant changes are on the horizon." He paused, his gaze sweeping across the hall, capturing the attention of every student. "Firstly, Defense Against the Dark Arts will be divided into two distinct subjects: Offensive Magic and Defensive Magic. Moreover, an array of magical arts, including Alchemy, Shamanism, Blood Magic, and many others, will be reintroduced to broaden your understanding and mastery of the magical world." Murmurs of intrigue mingled with whispers of uncertainty as the students absorbed this profound announcement.

The ghostly figure's voice rang out once more, steady and resolute. "From this moment forward, I shall personally undertake the responsibility of instructing you in both Defensive and Offensive Magic. As for how you shall address me, in times long past, students referred to us as 'Masters.' However, given the changing times," he cast his eyes around the hall, his gaze meeting the curious gazes of the students, "you may address me as Professor Salazar Slytherin." Pandemonium erupted in the Great Hall, a cacophony of gasps, whispers, and excited chatter filling the air.