This quiestion may be dumb, but is there a way to create a pointlight in unity2d that darkens instead of producing light? I'm using URP by the way.
Click the Fog Colour box, set the ambient light to 29 on each of the RGB sliders. You can see the change in the scene, pick a colour that is dark but not pitch-black. Click the Ambient Light Colour box, set the ambient light to 51 on each of the RGB sliders. You can see the change in the scene.