After Yasaka sent her daughter to play, Rias and Yasaka went to a more private place where they could talk freely.
"Actually, my father sent me here for two things, one of them is more formal, and another is more personal. For the first, I will start with the formality. The Emperor of the Chthonian Empire is proposing for the West Youkai Faction to be merged into the Chthonian Empire of the Baator. Of course, all Youkai will get the same benefits as any other citizens after signing Blood and Soul Void-Geass."
Said Rias seriously, as Yasaka's gaze hardened.
"As you surely know, Your Highness, West Youkai Faction is vassal to the Shinto Pantheon, similar to the East Youkai Faction. I doubt that this is an appropriate proposal."
Said Yasak slowly as Rias looked indifferent to this statement.
"Indeed it is... for now."
Said Rias quietly, as Yasaka's ears perked up hearing this.
"What do yo-"
Suddenly she stopped in the middle of her question as she stood up and looked in the direction where the entrance to the Takamagahara was located.
***
Several minutes earlier, Takamagahara.
"So, why have you called us here, sister?"
Asked Susanoo as he looked at his sister Amaterasu.
"I want to know, why have you been helping enemies of the Empire to murder the daughter of the Emperor and another one of the important noble heirs, brother?"
Amaterasu asked as Susanoo shrugged.
"They are dangerous, and god knows what they are doing in the Dimensional Gap; you have heard the rumors that the Empire wishes to tear it down, so they could access the Astral Boundary."
Answered Susanoo, as he was always most warmongering among the three of them, but even Amaterasu could see some sense in his words.
Even she has heard disturbing rumors around that the Empire, Celestial Court, and Shiva's Faction of Hindus had some kind of silent agreement that they would destroy the Dimensional Gap. Other facts didn't help that, primarily in past centuries, the Empire aggressively conquered and exterminated countless civilizations out there for resources.
"Even if you are right, if they find out about your involvement, it would cause war, a war we are not ready to wage. We have only one sleeping Mighty Stage God. In contrast, Empire has several Apocalypse-Class beings; we can only stay defensive in the potential conflict and hope our Pantheon World is strong enough to cause Empire such losses that they would drop the siege and retreat. If not..."
Suddenly Amaterasu sensed something weird in the Takamagahara.
"What it is, sister?"
Asked her, her other sibling Tsukuyomi.
"The Pantheon World is sealed."
She said with a pale face, as suddenly a teleportation circle activated, bearing the sigil of the Chthonian Empire, and a huge arcanotech device appeared from it with the shape of an egg, as it gleamed in the red light.
In a split of a second, the red light enveloped the entire Takamagahara, and the explosion devoured everything; not even dust remained.
***
Meanwhile, outside the Takamagahara, several people wearing military uniforms of the Imperialis Militarum were standing and watching the spectacle.
"I must say, you did a marvelous job developing this Magister Beelzebub."
Praised elderly Lord General Behemoth as he gripped his walking cane. Behind him were several Generals and even some Lord Generals of the Imperialis Militarum. Even Lord Marshall Militant Empress Hela was present, together with members of other branches, especially Navis Imperialis, including Lord High Admiral.
Everyone came to observe the destruction of the Takamagahara, or more precisely, to see the first generation of the weapons of mass destruction developed by Magisterium of Arcanotech.
DMM Bomb or Dark Matter Magicule Bomb was the first type of mass destruction weapon that was able to destroy entire worlds easily; its explosion is comparable to the attack of weaker Holy Spirit Warlocks or Dimensional-Class powerhouse.
"The results were acceptable; within the next one thousand years, we went to develop weapons that could injure Warlock Emperors and similar powerhouses, which itself is a rather ambitious goal within such short time."
One thousand years may sound incredibly long, but in reality, it wasn't. During countless years of experimentation and research, it was found out that the natural lifespan of a devil is around 10,000 Years, and with each Class, it would increase by a few centuries. However, in the higher Class, it will be increased by a few thousand years if calculated correctly, then the lifespan of a devil before reaching Apocalypse-Class should be around a hundred thousand years.
Tier 11 powerhouses and similar already stood on the pinnacle of any Universes, if you don't count those entities above.
***
"So it already happened?"
Questioned Rias as she looked at Yasaka.
"How?"
Asked Yasaka with a shaky voice.
"Several centuries ago, father managed to get into the Takamagahara, as he was on an audience with Shinto Gods. During his short stay there, he placed there a seal with a special arcanotech artifact, crafted with advanced arcanotech and strong magic. Now, it has just activated and transported a weapon into Takamagahara, which instantly exploded, thus destroying the entire Dimensional Pantheon World."
Explained Rias as Yasaka realized that the entire Shinto Pantheon was no more as Takamagahara was destroyed and all of its gods were killed in that massive explosion.
"In that case, I agree."
Responded Yasaka as she realized that her faction had lost its biggest backer.
"Splendid, my brother will be happy to meet his partner and daughter."
Clapped Rias happily while Yasaka paled considerably.