Random thought. Meteion coming from Etheirys allows us to understand what she is. She is trying to bring about the end of our world. But it's stated that she was doing this to others as well. What's worse? The end of our world being a pet project 12k years ago, or some other civilization finding out that the end of their world is some pet project of a completely different planet? Imagine being a different civilization and getting to Ultima Thule and seeing a little bird child is what's killing you.