Creation.

Yang Dao's word made the three people fall into contemplation. They were all leaders of their respective regions. How could they not be aware of what Yang Dao had said? However, those who group up in a cage themselves cannot teach others about the life outside it. 

The lady from the water region said, "I can understand what you are saying, Dao. But what do you say about the great war? The lives, our people sacrificed? I can calculate, along with your notion of wanting to make a world where the four elemental regions merge to keep each other in check. But do you think it is that easy for our people to forget the past?"