Get darker light in specific place

Hi friends

I have village and near it there is dark forest. I want to have darker light in dark forest.I have directional light in my scene.
any ideas how to make this.

Use a post process volume to adjust the lighting levels or even add a tint in that area, just drag one into the scene and set it up around the forest area and as soon as the player walks into the volume the darker settings will take effect.

but there is a problem - if you inside post process with dark you can see bright area as a dark too