Standing on the balcony of the highest tower of Ravenclaw Castle, Crown Prince Draco Malfoy of Slytherin heaved a heavy sigh, whether of relief or frustration, we may never know. With the fall of Ravenclaw to Slytherin and the murder of the king of Ravenclaw at his own hand, Draco knew he should be feeling proud, elated even. However, for some reason, some small part of him still felt a tinge of regret.
Draco felt a hand on his shoulder.
"Well done my son. You have done well. Soon the reign of Slytherin will be in order," King Lucius said.
Draco could only nod his head. He felt it was ironic that just moments and maybe years ago, he would killed for any opportunity to prove his worth for the Dark Lord and eliminate his opposition. Now that he had murdered one of his opposition, all he could feel was... uncertainty...regret...guilt. But, he knew better than to voice his disagreements with his father. After all, he the Crown Prince of Slytherin and he needed the people to see him as a worthy leader, capable of dominating the lands.
Glancing down towards the capital of Ravenclaw, Draco could see Slytherin soldiers and guards rounding up any Ravenclaw citizens, before sending them to forced labor camps. Pushing away his last remaining signs of guilt, he reminded and berated himself firmly and harshly that this was for the greater good for the Dark Lord. Once all of Hogwarts continent is decorated in the colors, emblems and symbols of his noble ancestor - Salazar Slytherin, he shall then reap the fruits of his labor and prove to himself that all he had done was worth it and necessary.
Just outside the corner of his eye, he could see Slytherin greatest military general, Bellatrix Lestrange preparing the Slytherin troops to continue advancing forward into Gryffindor borders. With the collapse of Ravenclaw, it resulted in Gryffindor kingdom being more vulnerable to a land invasion by Slytherin. However, he knows that any attempt to conquer Gryffindor would not be an easy feat. Even Hufflepuff would not fall as easily due to various strategic points Hufflepuff troops could take up positions at. Ravenclaw kingdom only fell due to the element of surprise and a lack of time for their troops to better prepare themselves for battle. Hufflepuff kingdom had the Petral Mountains to slow down Slytherin invaders and give Hufflepuff more time for preparation. As for Gryffindor, Ravenclaw and Hufflepuff borders protecting Gryffindor allowed them to prepare their troops more effectively.
Draco knew that should any effort to conquer the remaining two kingdoms via only their wizarding army fail, King Lucius Malfoy would most likely not hesitate to utilize the secret weapon in the Chamber for his goals.
Author's Notes
Yes, the attacker in chapter 11 was Draco. I wonder how Jean and Hermione would react with the murder of their father...