Quick Author's Note.
To dragonngo, damn. You make a lot of good points. I didn't destroy Kaschey yet because I needed him for the upcoming Ch'en-Talulah reunion battle. I want to keep that part of the canon timeline in the story. As for why Shirou used the Holy Grail's Master-Servant contract system, it's because he can't use any other contracts unless it's a physically written one. He's just trash at it. So he used the one closest he had, which was made possible by Rin and Sakura's help and the Holy Grail he always carries. This is the only way he could coerce Talulah to give him information since threats were useless.
Yes, Talulah gets buffed by suddenly getting a lot of mana/magic energy from the Holy Grail as per the war rules/contract system. Nothing like elevating her to Caster-level power but can only use fire since it's all she knows how to do LOL.
As for why this fanfic is a bit iffy on the Nasuverse lore, I'm only following it slightly. I'm more leaning to the Arknights lore and reality because this is in Terra/Arknights universe. It would be less confusing to not bring all the Nasu stuff over when I can just focus on Terra stories or explain it as world differences. Makes for more interesting experiments.
=== CHERNOBOG CONTROL TOWER ===
Shirou looked around the control room.
It had a large view deck overlooking the city around it- only if the city wasn't ruined and burning in flames. The horizon in the distance was lightening up slightly, normally the signal of a bright new day. Now it was nothing but a distraction over an otherwise remarkable view. Against the darkness, the city was like a bonfire of chaos and destruction. Fires illuminating various sectors, billowing visible smoke up into the heavens.
In the distance, Shirou could see the shadow of Lungmen. The Yanese city was splitting apart into several plates, but it was going too slowly. A few outer plates have split off, several more in the process of disconnecting from the inner plates. Even if those city plates escaped in time, the inner plates were all still stuck together. They wouldn't have time to split apart, nor would they even escape the path of Chernobog's energy plate before the impact.
Shirou estimated that it would take a few hours for the Chernobog core to reach Lungmen. It was impossible to stop the city completely, but shutting down the engines should slow its momentum to a stop...within a certain range that is. If they crossed that line, then the core would still impact Lungmen. Perhaps they would be lucky if the impact didn't trigger the core to collapse, but it was still too dangerous.
If the information he remembered was right, then the Ursus 4th Army was just right behind Chernobog, waiting for an opportunity to cross into Yan's border.
Shirou wouldn't let that happen.
He inserted the master key into Chernobog's head module. Normally the control room would have operators keeping track of the systems, but there was no one to be found when he arrived. Talulah or Kaschey must've killed them off. They would be the first line of defense against hijacking the city's control room which would make them a priority.
Trace On.
Shirou looked at the control module in front of him. Luckily, it wasn't too complex a piece of machinery to scan. Terra was a little behind Earth when it came to technology. Ursus had a preference for relying on older, cheaper, more reliable tech- which led them to focus on analog across their nation. Since analog was entirely physical, Shirou was able to deconstruct the control room after tracing the area.
Luckily, Talulah or Kashchey didn't destroy the place. They probably assumed that nobody would know how to use the controls. In most cases, nobody would. But Shirou was just a cheat that bypassed the norm when it came to deconstructing how objects worked.
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