I just finished another reread of the story.
Cori's plan makes more sense every time and that scares me.
I really just need to say again how much I love this story. I don't think any other story has made me care about the characters and the world as this one has.
A few thoughts that came up during my reread:
It's very interesting how you have managed to balance Diya's desire to hide their nature as a Banette with the idea that things will be okay if people find out about them.
Blades of grass wilted, flowers fell, berries liquified, and mushrooms sprouted from the remains, as three Treavenants took ahold of the nearby trees. A red glow burst from a knot in each of the trees they took as they looked out onto the living world. She could identify the feel of her grandmother in one of them, though the other two were new to Urskog. She didn't care. More help was more help. She whined to her grandmother and the other Treavenants and motioned as if to lift her mother with her vines.
This scene really stood out to me this time.
The fact that, between fending off an angry Abomasnow that wants to eat their grandchildren and standing vigil over their dying children while they wait for a Frosslass to come, the latter is the one that Treavenants will not do alone really shows how much they care.
They could have just been some kind of guardian spirit that protects their living family because they were made to do so, but things like this, and Urskog's grandmother and mother sticking around to meet the Bulbasaurs after they are called, really show that the Treavenants are there not because they have to be, but because they chose to keep fighting, to struggle against death for one more day to protect their family and watch them grow, right up until they can't anymore.
That is something beautiful about the world you've made here, thank you for sharing it with us.