After talking to Rost he will tell you that he has to leave and go far away from Aloy.
A simple objective, follow the square, yellow icon on your user interface to locate your old friend. He will offer you some items to aid you and will give you a Nora Brave for free.
Follow the path ahead. You'll find Karst along the way, talk to him to get the Free Sample Box.
Continue down the path to the Matriarchs' Lodge for a cut-scene.
Aloy notices a man with a device similar to her Focus. Talk to him to start a cut-scene.
You are free to roam around and explore the village but to continue the quest follow the path ahead to the Blessing Ceremony for another cut-scene.
Olin will be at the ceremony. Talk to him to start another cut-scene.
Follow the objective icon on your user interface to locate the Hunter's Lodge and another cut-scene will start.
Inside the Hunter's Lodge there will be other candidates for the Proving. Walk up to Bast for another cut-scene. You may also talk to Vala to learn more about her or you can go to bed to start the next sequence to the next main quest line: The Proving.
