DISCLAIMER: I'm not British. I don't live in England. I am a man. Ergo im NOT J.K Rowling. Who is British, lives in england, and is a woman. therefore I do NOT own Harry Potter.
The ministry had fallen, Harry Potter was on the run and had vanished, magical great Britain had given up. Death eaters openly roamed the streets of diagonal alley, muggleborns were hunted down and being murdered. Voldemort had won. The last beacon of light, the last hope for those who fought was Hogwarts. Her ancient wards were the most powerful on the entire European continent. Perhaps the strongest in the world. A thousand years of being fed by ley lines had given the castle a sentience and she could tell dark times were upon them.
In the headmasters office Severus Snape paced while talking to the castle.
"He will come here. He will come for the children to use as bargaining chips. How I ever served that man is beyond me. He is cruel, evil and literally almost soulless. The time has come. My true allegiance shall be made known." The ground shook and the windows flared red. Hogwarts was warning him, voldemort was approaching with his army.
Snape sighed in deep regret of the harm he had caused, as a spy he had been required to act a certain way. Now would any truly believe him, would Potter truly believe him? Probably not. That's ok, in the end as long as voldemort falls that's all that matters. He would see Lilly again soon.
Then with a conviction in his voice, born of confidence won in the fires of war Severus Snape said just three words. three words that would forever change history.
"Hogwarts to war!" There was a wailing sound and the bells began to frantically toll. Then all around the grounds of Hogwarts a shimmering done appeared, then another and another, all interweaving and absorbing each other as the war wards of Hogwarts were activated. On a hill overlooking the grounds Voldemort froze as a shining silver doe trotted up to him and the voice of his most loyal servant, Snape came out of its mouth.
"I denounce you. You have lied, cheated, stolen and murdered. By the laws of the ancients under the eyes of magic I Severus Snape REVOKE out bond and denounce you as my liege. I shall serve you no longer. I shall protect the student and staff against you. I have raised the war wards. You cannot enter.
Voldemort froze is shock. Then screamed in rage. Through his master rune he felt Snape dark mark vanish as well as his connection to him. Whipping out the elder wand he unleashed a beam of pure raw magic. It struck the dome protecting the ancient school, and was absorbed.
The wards of Hogwarts were impenetrable as any magic used against them was absorbed and made them stronger. For over 45 minutes voldemort tried to breach the school and finally he stopped. Lowering his wand, the wards stronger then ever.
"Summon my entire army. We March on Hogwarts at dawn."
In the castle Snape released a breath in awe. He knew the the wards were strong but to survive that long, and be even stronger how was that possible?
No matter " Hogwarts activate emergency defenses. Lethal level authorized. Protect the students at all costs." A second wailing sound was heard as the students found themselves in their common rooms. Transported by the school. Then the portraits melted into the walls. In the common rooms all the doors disappeared.
Thud. Thud. Thud. Throughout the entire school the sound was heard. Every statue, suit of armor, and carving had come to life and was marching. They manned the battlements and perimeter of the wards and screeches were heard from the Forbidden Forest and the centaurs galloped out, dressed in armor and toting weapons of war. They to took up position inside the wards, ready to fulfill their ancient pact with the founders. From deep in the bowels of the school, in the near forgotten chamber of secrets a golden glow suffused the bones of the basilisk as it regenerated. Blood vessels, muscle tissue,scales all of it was regenerated. The basilisk was returned to full health. It's mind freed from the dark magics of the teenage voldemort, it sought to fulfill its purpose. The final guardian of the school.
Fawkes screeched and 40 phoenixes from all over the color spectrum appeared to enhance the protective magic of the school and defend against dark creatures.
At last the armies of Hogwarts were assembled. Yet, unknown to all there was another layer of protection. A deal struck millennia ago. A final resort should the wards fall. A final countermeasure of such power not even a demon Lord could have withstood it.
Dawn approached and dementors, acromantula, werewolves, and dark wizards assembled outside the wards. The wizards raised their wands and fired all manner of curses. The shield shook from the impact but held strong. The battle of Hogwarts was begun.
AUTHORS NOTE: I am sorry for any spelling or grammar issues. I am writing this all on my phone and auto-fill is a nightmare. Please read and review. Hes I am know I have other stories. This is mostly just a few chapters obased on an idea a song gave me.