- Location
- Washington, USA
Going by Icarus Rune specs, it kind of looks like if we set our sights on a "no EM in this AoE" rune it might have an utterly bonkers radius. A full-size Icarus Rune has a radius of 12.5 kilometers, and if we can match that on the EM ward then it might legitimately not be possible to get high enough above the ward to assault the city that way. It's not a given, but it honestly looks pretty reasonable that we could make an actually-effective EM ward rune.
The other part... yeah. If safety against nuclear war is maintained solely by one ninja and his ultra-esoteric discipline, it's a very fragile safety that outright cannot be expected to last long. But hey, thinking positively, maybe a few decades of breathing room will let Hazou cook up some other, more permanent solution! Or at least, as vague as that hope is it's reasonable enough that I can't outright call the strategy unviable. It's just... rough, on top of the other flaws I mentioned previously. I do think if it were solely up to me I wouldn't have wagered everything on a bet this shady.
Design the anti-EM-nuke rune to enforce a minimum temperature of 100K, and maximum sustained wind speed of 50mph, such that trying to go beyond runs into runic-drag-like resistance. Carve an exception for short bursts from active chakra effects, so wind jutsu and explosives still work. Spec early versions to cover individual cities, then build a veterancy chain aiming for a radius of a thousand miles and duration of a thousand years. Nice round number. After that it's the next Rinnegan-bearer's problem.That would definitely help, though I'm not sure it would work per se. For example, what if they cast it upriver? What if they cast 30 of them around the city; would it remain habitable? I do think you avoid instant destruction scenarios but I'm not convinced that even helps if you can't also tell who was responsible.
Results will get weird where tornadoes, hurricanes, or other extreme weather events would have naturally formed, and even more so in the upper atmosphere, but probably net beneficial to civilian welfare overall. If it turns out to be inconvenient for industrial development (by, say, interfering with the internals of smelters or steam engines), budget some A-rank till-n-fill missions for setting up the necessary machinery and a supporting town on the edge of the map.