In this episode we finally enter Mother's Heart. Aloy has trained for The Proving most of her life, and it's almost here! After living in the wilds her entire life, Aloy gets to see how the other Nora live. She meets High Matriarch Teersa, see Teb again after a long time, and sees outlanders for the first time.

The Carja and Oseram are here from the Carja Sundom to observe The Proving, but tensions are high due to the Carja's conducting The Red Raids. This is all new to Aloy, so we learn a lot about the Nora, Carja, Oseram, and the political state of Horizon Zero Dawn.