There are other metals and they just like do stuff. Gold lets you see who someone was who you were in the past if you had made different choices. That doesn't. So mostly it's like seeing the code in the matrix. And then there's the elusive 11th metal that Kelsey or thinks is and this is the end of the plan. He's going to help him kill the Lord ruler. But on a micro level, it explores trust and whether or not characters can and should trust one another.