Verdigris Discus is a Talisman in Elden Ring Shadow of the Erdtree DLC that raises defense with higher equipment load. It is found after you travel to the Rauh Ruins from Scadu Atlus.
To find the Verdigris Discus, use the imbued stone key to unlock a teleporter that transports you to the Ancient Rauh Ruins. Head northeast from there to locate the talisman in front of a statue.
The imbued stone key is required to reach the location of this talisman. Here is a video walkthrough on how to get both items:
