And now for something completely different...
After discussing with our fellow RanVor on the AO3 comments about how young Ensi would learn about magic, I had this idea for an AU story where Ensi learns magic from some dark origin.
Perhaps Tuonetar, the Queen of the Underworld, wife of Tuoni, would show up and teach her...
And then Ensi could (would?) grow and become powerful, maybe even too powerful. Galadriel's test, when she has the opportunity to have the One Ring, is what comes to my mind...
"And now at last it comes. You will give me the Ring freely! In place of the Dark Lord you will set up a Queen. And I shall not be dark, but beautiful and terrible as the Morning and the Night! Fair as the Sea and the Sun and the Snow upon the Mountain! Dreadful as the Storm and the Lightning! Stronger than the foundations of the earth. All shall love me and despair!"
(that was, BTW, one of the most chilling and cool parts of the book and the movie)
That could be a nice starting point. And then, maybe, it would be up to her grandchildren to save Finland from her grandmother...