Kavvoh is the NPC that you have to save in the Blood for Blood side quest in Horizon Forbidden West. He turns his back on the Tenakth early on and sides with Regalla, but soon realizes their rebellion is not what he thought. When Aloy meets him, he warns a settlement about an attack, and you manage to stop him thanks to his efforts. This guide explains what happens to Kavvoh after you rescue him.
Kavvoh returns to The Grove with Dekka
As Dekka had hoped, Kavvoh returns to The Grove with her. You can both walk around in the museum part of the settlement. See the map reference above for the exact location. If you speak to Dekka, she will stand by Kavvoh, happy to have her only living relative with her, and try to ingratiate herself with his tribe again.
Kavvoh is an interesting supporting character as his only role is acting as a suspected liar. Aloy distrusts him at first, but sees the benefit of following his trail if it turns out to be true. You can see the full story unfold by completing the Blood for Blood side quest, which also shows how much family means to Dekka, a grandmother who survived almost all of her family.
https://www.gamepur.com/guides/what-happens-to-kavvoh-after-blood-for-blood-in-horizon-forbidden-west What happens to Kavvoh after Blood for Blood in Horizon Forbidden West?