Massacre at Domain Montserrat

Massacre at Domain Montserrat was a battle in the war between the Re-Estize Kingdom and the Sorcerer Kingdom waged to erase any evidence of the latter's pre-war conspiracy. It was the last major battle of the conflict.

Background
Following the complete takeover of the capital of the Re-Estize Kingdom, the Sorcerer Kingdom proceeded to focus their attention on the remaining territories. The Guardian Overseer and Prime Minister of the Sorcerer Kingdom, Albedo, volunteer to handle Domain Montserrat personally.

The purpose for carrying out this operation was to tie up any loose ends that could later create issues with their war's justifications, that is to deal with Philip, the upstart noble whose delusions single-handedly brought about this war and ultimately the downfall of the Re-Estize Kingdom. This was done to remove any traces hinting that the Sorcerer Kingdom has had any prior relations with Philip that could potentially implicate them as the ones responsible for manipulating him to start the war and later negatively effect future operations by their enemies.

And for the Sorcerer Kingdom to properly retaliate against the perpetrator for the complications that caused them to waste a considerable amount of manpower, resources and time to take over the Re-Estize Kingdom. This is by using the most destructive methods possible out of their originally intended plan and time table due to them now being forced into a corner on how to deal with the unexpected grain-theft done by the latter's actions. At the same time, it was done so in order to reiterate their national policies to other nations of not tolerating any form of hostility towards the Sorcerer Kingdom due to the likely increase in national interference from other hostile nations against them.

Although another, more personal reason for this massacre was likely Albedo's grudge against Philip for ruining her plans of a more discreet conquest of the Re-Estize Kingdom and his actions of making her seem like a fool in front of her Master.

Battle
While it's unknown how the battle occurred it can be presumed that Albedo's sheer power was enough to completely decimate whatever remains of opposition the domain had. Albedo personally decapitates Philip's "closest aides" before impaling the rest. All the while Philip slept in his bedchamber, unaware of slaughter happening outside his manor for Albedo has cast a noise canceling area spell around his room in order to prevent the screams and noises made by her victims from attracting attention. Before his death, Philip’s father, Baron Montserrat, request the Overseer to make his son suffer and be inflicted the very same pain he put his countrymen through.

Aftermath
Albedo proceeded to enter Philip's home and sat at the head of the dining table. Upon seeing the white maiden, the noble believed that she came for him like in his fantasies. Albedo decides to make this simpler by giving him a box containing the heads of Wayne Delvin and Igor Rokerson. Upon seeing the decapitated heads of his confidants, Philip was quickly brought back to the harsh reality of the world he found himself in. Refusing to accept this kind of predicament, Philip attempts to call for help from his servants to no avail. Albedo then proceeded to drag him outside by the ear to show him, to his horror, the aftermath of her butchery. She then informed him that the man would not be given a quick death like his friends and family but instead would be used as a test subject in torture methods. Albedo decided that it would be the best way to fulfill the wish of Philip's father.

Trivia

 * In the anime, there was several differences from what happened in the Light Novel. Unlike in the Novel, Philip was shown to not have hysterically broken down and balled into a crying mess when faced with Albedo's "gift" and the scene where entire populace of the Montserrat territory was impaled in a forest of stakes was removed completely. Instead Philip's "gift" contained the severed heads of Igor Rokerlen,Wayne Delvin and the Former Baron Montserrat and Philip himself was fully aware of what Albedo would do to him.