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1

In order for those two dimensions to engage in diplomacy, you need some form of peaceful interaction between them. Peaceful interaction requires that both dimensions want something the other dimension can provide. If both sides want something the other side has in abundance, then they could engage in trade. If one side has something they don't want to part ...


2

Arbitrage The two worlds are not identical, and goods have differing prices between the two dimensions. Your secret society buys goods in one market and sells them in the other, slowly building up their wealth in both dimensions' currencies. Secret societies need lots of dark money to survive. This is their main income.


1

There are already a few examples of this in film and TV. As AlexP mentions in the comments, Counterpart matches your question fairly well. Another example that springs to mind is Fringe, which also has cooperation between two universes. The idea is also touched on in various SF shows like Stargate (and Stargate: Atlantis) where the primary universe has ...


2

It doesn't matter if Empire B knows how to make the weapon. Case I - Empire B does not have the weapon Options Submit to Empire A Die with the world and everything else by the weapon Case II - Empire B DOES have the weapon Options Submit to Empire A Die with the world and everything else by the weapon Does it really matter if Empire A pushes the button ...


2

Empire A should announce that they have the doomsday weapon, and request a meeting. During this meeting, Empire B would send a delegation consisting of the most trusted and patriotic people, including at least one scientist/wizard who could verify the claims, given the evidence that Empire A's science division has produced. Empire A would put all the proof ...


9

Just wait for the right time Empire A should fight their war with Empire B. If it goes badly enough that they want to abandon their chance at victory, then they should show Empire B how the weapon works. This way, Empire A still has a chance to win, but Empire B does not. While fighting their war, Empire A should still claim to have the weapon, but only for ...


2

Dr. Strangelove, I presume? Doomsday devices are not far-fetched. It is actually something that happened during the Cold War. It is still happening. At least one exists on Earth, and is fully functional right now (if Wikpedia and Vladimir Putin are to be believed). Allow me to present: Dead Hand. During the Cold War, the Soviets built a system designed to ...


2

If the common population won't admit Covid-19 exists until people start dying from it, the government of Empire B won't believe a doomsday weapon exists either. The answer is simple. Demonstrate the weapon on another planet. If you could make this device, then you could move to the nearest planet as well. If not, you have to make a scaled down version at ...


3

Condemned prisoners Empire B has sent a few spies to learn the secret of Cobalt-Thorium G. Unfortunately for them, they have been caught, and await execution. Luckily for them, Empire A has had a change of heart and has allowed them a chance to pore over all of the technical schematics and interview key scientists! Unluckily for them, they will only get a ...


3

You can prove that you have a doomsday weapon by enacting the Doomsday Weapon Antiproliferation treaty with empire B To start, you must immediately disassemble the doomsday machine. There is no situation where the use of the weapon by any actor results in a favorable outcome for anyone. Then send send the math that proves it is a doomsday weapon. Once the ...


13

Feed the Moles An open declaration that Empire A has the doomsday weapon is likely to be treated with scepticism as a possible bluff. Better to let Empire B find it out for itself, and think that it is doing so covertly. Given their geopolitical rivalry, presumably Empire B has networks of spies embedded in Empire A's ranks. Most likely some of them are ...


9

My Dearest Emperor B, As befits the closest of eternal friends, I hope my messenger finds you and your lovely spouse in good health. Thank you for your recent gift of exotic animals and slaves; they were delicious. It is my most fervent wish that you enjoy the reciprocal gift that accompanies this letter. I include a humorous anecdote: My foolish and ...


17

As described after your edit this is just a doomsday device for mutual destruction. It really doesn't matter if the other empire figures out how to make one as using it is only going to be even remotely sane if your are facing utter and complete annihilation anyway. It is useless for conquest. Telling them you have a doomsday weapon means they know they can ...


6

Get the wizards drunk or otherwise damage their memory after they verify the weapon is functional. Have the wizards use their magic to prove the artifact will work, and then work to damage their memory with drugs or magic or concussion or death. Since you are threatening to destroy the world, threatening a few scientists is a minor concession. You can simply ...


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