Sorry

Yeah. The thing with the summons is that they're apparently just magic talking animals separate from regular animals, some of whom live in special places.

In canon, only the Frogs and snakes are known to practice Sage Mode, with bonus materials suggesting that the slugs also know how, but this is a fan game, we don't have to limit it as such and can have as many sets of summons have a sage as we want.

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Sorry

Yeah. The thing with the summons is that they're apparently just magic talking animals separate from regular animals, some of whom live in special places.

In canon, only the Frogs and snakes are known to practice Sage Mode, with bonus materials suggesting that the slugs also know how, but this is a fan game, we don't have to limit it as such and can have as many sets of summons have a sage as we want.

We can do anything: For Example, in canon Minato Namikaze created the Rasengan by studying the tailed beast ball and his son Naruto Uzumaki eventually perfected it by combining it with wind release, turning it from a spiraling ball of energy to a spiraling ball of energy that shreds things at the molecular level. A generation later, Naruto's prodigy son Boruto Uzumaki creates a more versatile version of the Rasengan by instinctively combining it with Lightning Release, creating a Rasengan that can be thrown and turns invisible.

None of those people exist in this game... But that doesn't mean that Kimiko couldn't independently create it on her own out of frustration with being unable to learn the Tailed Beast Ball and then combine it with Paper Release to create a spiraling ball that messes you up but then expands out to trap you in a paper-based barrier or fuinjutsu.

Or Usagi independently creating it and then combining it with whatever her nature is to make a version that can be shot as an arrow.