We've had our adventures with all 7 Elemental Nations (and Lunar). Snezhnaya should be the last theoretical stop in the elemental Nations journey, so what comes after that?
While it's hard to predict exact events, it's easy to predict the general trend of a story by drawing conclusions from what we know so far.
[SPOILER WARNING]
Let's start with Pyro Gnosis and its current fate.
According to Mavuika, it can make new Ley Lines, hence its existence in Natlan where Ley Lines were nearly destroyed during the Abyssal invasion. Capitano also confirms its ability to create new ley lines.
Then it was used by Nahida to burn down Irminsul, supposedly destroyed in the fire and returned to the le
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