What Happens in Way of Water?

In the first avatar we have an element called unobtainium. In the second movie it's the exact same thing except instead of being located at home tree, it's located a little bit of a spoiler here. It's located inside of the turquen, the giant whale-like creature with whom the boy has bonded. And again, there are some spoilers here. We're going to see the relationship between a boy and his whale-like Creature. These two outcasts who find each other. But then we're going to kill the turqen, right?