Kratos' Oath Stone appears in God of War Ragnarök: Valhalla. It is an object that Kratos obtains while in Valhalla. After the Mystic Gateway takes you to a room you receive an item from Kratos' past - a manifestation of guilt over his past actions. This first item is Kratos' Oath Stone, a symbol of the pact he made with Ares, the God of War who bound Kratos to his fate in exchange for giving him the power to help his people.
God of War Ragnarök: Valhalla[]
| “ | Valhalla has conjured an object from my past... an amber stone symbolizing the sworn oath of a prisoner, an oath observed and enforced by The Furies of my homeland. It is a painful reminder of the oath I once pledged to Ares... the day I strayed from a worthy and honorable path. | ” |
–Kratos on the Oath Stone | ||