https://www.gamespot.com/articles/god-of-war-ps4-still-has-a-secret-to-be-found/1100-6459369/

God of War has been out for well over a month now--enough time that most games would have been plumbed clean of Easter eggs and secrets. Apparently though, Sony Santa Monica's latest still has something left to find.

"I still think there is one thing that no one has found yet that I know for certain, because I haven't seen any stories about it," game director Cory Barlog told Gaming Bolt. "Now I'm not going to tell you what that is, but I don't know if there's any cinematics per se, it seems like people have been able to get all the permutations. Not one person, but everyone collectively."