So two worlds with two versions of a person's self correct?
I like the idea but is there more to this? I mean other than the challenge of fixing something so that both worlds are 'correct' so to speak once more.
yes to your first part. The idea in my mind is to create two characters similar but slightly deference, having character flaws. Each would also have character pluses. They would learn from each other as they go about solving the challenge.
As for the challenge,I am thinking it is to find certain elements that would stabilize the decaying gate points. If they decay to far the realms would fold into the other and cease to be.
The challenge can be developed as we go.