Voldemort noticed.
He raged.
And then, he acted.
Death Eaters surrounded Hogwarts. Giants marched from the Forbidden Forest. Dementors blotted out the sky. This time, Voldemort came prepared to burn the castle down to its bones.
But Hogwarts was ready.
"Deploying Arcane Fortress Mode."
Wards slammed into place like walls of steel.
The viaduct bridge transformed into a retractable drawbridge that dropped invading giants into the ravine.
The Arcane Eyes coordinated with Professors and the Order of the Phoenix, providing instant battlefield awareness.
Statues and suits of armor became intelligent defenders, dueling and shielding students with mechanical elegance.
The Room of Requirement became an emergency healing center, stocked with potion-printing enchantments and spell-cooling charms.
Harry stood at the ramparts, cloak billowing, as ARC announced:
"Hogwarts Online. All defensive protocols active. Magical combat simulation linked to tactical spell net. Good luck, Commander."
He nodded. "Let's finish this."