"How can I create something like this pocket dimension… It would potentially allow for travel without having to carry 25 kilograms of rare and expensive Iridium metal for use in the creation of return portals… If you need something to destroy an egg… I do know how to construct a thermonuclear device with yield of up to 50 megatons… I know where to acquire the necessary material for it’s construction… but it will take several months to accumulate the tritium needed for fusion reaction that will greatly increase yield of standard fission bomb…"
"Such a device would not be light, the simplest I could make it without casing would be nearly 5 metric tons… however it would be more portable than entire missile or bomber aircraft that would otherwise need to deliver it."
"The ability to create a reality marble like this is not an easy task. I was trained by a close friend of mine on how to maintain it. The amount of energy needed to cut yourself from the world is very high. It also helps to have a connection to a relic from the past. I don’t regularly reveal such information; however, I had the sheath of the legendary sword Excalibur placed inside of me, where it remains to this day. Having a connection to it since I was a mere child impressed it’s spiritual memories into me. Therefore, my life is forever connected to blades." Shirouko said.
"Obtaining a Reality Marble is not something everyone can achieve through research alone. It requires a lot of internal thought and mere will power alone. I highly suggest that you look into various meditations. Since you seem to be aware of magical girls, try chatting with them about the nature of ‘magic’ or the manipulation of mana. I suppose you could compare the studies of ‘magic’ to your world’s empirical system. However, it might take a leap of faith so to speak for you since the world you’ll be looking into is not logical by the human view of things."
"A device of that nature, you say….That might work. I’d have to make sure that the city is evacuated before I could even begin to plot something like that. Though since we’re dealing with a nasty that has a pocket world of it’s own…That might help to negate the possible issues."