Ymir can see everything in the paths. Every Eldian from the past, present, and future, she can see it all. Even in other timelines she can observe it all. That is only the tip of the iceberg of her seemingly unlimited powers, she's in all layman's term a god. Really the only limitation is that she can only affect those of Eldian's blood. So she wonder what would happen if Eren Yeager never been born; instead someone else takes his place. Someone who also sought freedom like him, someone who has the knowledge of the future. What will happen? Will it repeat, with them starting the Rumbling? Save the island? Or will they lead Paradis to ruin?