That's what it's looking like, yeah. Wouldn't be quite nearly as fun if we're limited to the Mundane, at least in my eyes(for what little that means).
Not necessarily the case if the fantasy world has had centuries of experience with magical warfare and magitech. Jets might have a hard time taking down a fortified magocratic city-state that's armed to the teeth. Would definitely apply to most of the world, if the average polity is a bunch of pseudo-fuedal village-dwelling mud-rakers.
In the original interest check, I mentioned the possibility of zones where the two worlds are physically merged. Also, I think there was some support for there being more than one contact point.
I'm for this too. This would be a little less political, and more unified in terms of sending some sort of international force (like a UN coalition of sorts). My reasoning being that regardless where that portal appears, everyone would more realistically react like "Holy shit guys! The hell is this?" Maybe later down the line when things settling, bases are established, ect, do we see countries trying to pull shit like Japan did in GATE.
I'm also for having an alternate world for the Modern nations. I'm thinking along the lines of Ace Combat or something, just so we can have a bit more creativity.
I hate magitech so damn much. I say sure to the odd heroes with vorpal swords and +5 armor, but I swear to god if I see an army of dudes with full-auto wands of destruction and armors of negate kinetic damage I will kill myself. I don't mean to say resisting would be impossible, but rather difficult and laughable if a nation decided to really flex its muscles and consider this a real, industrial scale, war.
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I have to disagree here-not with your specific examples per say(full auto wands and armors of negating kinetics and whatnot sound dumb, at least until a cultural exchange occurs and people start experimenting with our our science interacts with their magic), but at the core all that quote-unquote "magitech" would really be is applying the scientific method to magic. Learning to harness it and utilize it in ways to the benefit of their society as a whole, although with magic as a force the need to technologically advance in a more traditional sense would be much lower(hence their status as medeival technologically, since they wouldn't need to scientifically advance nearly so much in order to improve their standard of life; they don't have microbial theory, but they don't need to in order to know 'Cure Disease' spells make sick people better, ect). I also disagree with the notion that a Magical nation couldn't compete realistically with a technological one. They might not have anywhere nearly so sophisticated mundane weapons, but in our terms any individual mage would have the potential to be equivalent to if not greater than our own primary weapons of war(tanks, artillery, ect) and weapons of mass destruction in and of themselves at the absolute most powerful. Not even mentioning the fact that with magic you could pump out armies on a industrial scale as well(golems, undead, ect), as well as (again, all things being potentially and dependent on how powerful magic is considered) ludicrously easy logistics if Mages can either teleport or just conjure food and resources. We know that instantaneous or at least near instantaneous travel is possible because Portals, so it wouldn't be unreasonable to think that Magi know how to use magic to transport supplies or armies quickly-an advantage we wouldn't have almost at all.
For nukes, I'd still go with MAD and them being the last resort button for deterrence.
If you push it, you lose everything automatically. But so does everybody else! So that means you shouldn't use it for random reasons because hey, even if the enemy is dead so are you. But that also means people can't bully you in the corner since the menace is mutual. You nuke me? I'll nuke you!
I think this could and should be used as a deterrent but the option should still be there.
Likewise if you nuke a magical nation which can't (I hope) nuke you back, there would be the fact that for everyone everywhere you will be the big bad guy for ever and ever, expect to be treated like north korea is today, etc. I think its reasonable and that we don't need fancy reasons to make the use of nukes worst, its already the worst case scenario to start with.
So is it just made up realistic nations? Or private groups deus ex/ undergroup societies/ pmcs/whatever I missed.