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This arc was epic, it really shows how powerful Fujin has gotten and gives face to Hiruzen's title of 'God of Shinobi'.
Steve could be highly talented in defence while possibly some weapon or light law. So he could be trained as some sort of Paladin.
It doesn't really matter if Orochimaru can control them or not since their all enemies of Konoha and not him. I love this twist in the arc, it felt like Fujin didn't have any challenges recently, this is making it more interesting and high stakes for Fujin to mess up. Great writing and stay well author.
Although I'm all for exploring seals and their uses like it has been in this novel, a huge issue is where does the energy source for these seals come from. Like in either xianxia or fantasy, formations and runic arrays still need a power source so it shouldn't be possible to inscribe millions of seals without requiring an enormous amount of energy. Otherwise every hidden village should just prioritise ninjas to learn them and the older the village, the greater their power by virtue of the higher number of seals. The battlefield method for instance makes sense since the ninja can power it with their own chakra and deploy it but where does the energy for Fujin's house come from, elemental stones?
To have internal laws, it would make sense to have an internal world like in xianxia stories where the cultivator personifies the world. Once their internal world is as complete as a Tier 10 with the required laws, they probably don't need to have the required willpower and can directly project their internal world as a domain and use their laws in any verse.
This is peak, finally Fujin isn't hiding. Thanks author for the moment. A potential way for Fujin to become even more OP is to develop a way to chakra absorb those who die in his wind domain which he can just transform into more wind chakra to expand his domain.
Copy Ninja much? 😀
The shadow clone can do that or one of its variants.
Another massacre incoming 😁
A failsafe could be to have an additional seal inside the 'dantian' which would send uncontrollable chakra to the void space where the flying thunder god goes to. Or they could choose to explode it if they want to damage the enemy before dying.