Clay in "War Dynasty" is a very important special resource in the game. If you want to get clay, you can go to the areas along the river, especially near the Susumu ruins east of your starting location. It's most abundant usually along river banks, but you can sometimes find it a little further from the water.
Where to get Warring Dynasty Clay
In Sengoku Dynasty, clay can be found in areas along rivers, especially near the Susumu Ruins east of your starting location. It's most abundant usually along river banks, but you can sometimes find it a little further from the water. Don't expect to find clay somewhere without fresh water, though.
Look for large brown mounds near water. In the winter, these mounds are covered with snow, but you can still tell they differ from regular ground—the mounds have a more raised texture. If you are unsure, you can approach these mounds and the game will display a message telling you that a mineral deposit has been discovered.