Blending alpha values

Is there a way to get the alpha values of two different sprites to not add up? For an example here is a photo of my problem. when the two shadows (they are separate sprites) pass over each other I'm trying to get the alpha value to be the same as the individual sprites. Pretty sure this should be possible with shaders, no? I'm relatively new to writing shaders but have been searching for a while now with no luck!

 

It looks like you want to blend your shadow sprites with everything except other shadows. If that is the case, you could render them all together as opaque to a RenderTexture, and then blend the RenderTexture with the screen with an ImageEffect. It looks like your game is pretty low resolution, so the rendertexture resolution shouldn't have to be huge.

 

Another option could be to use the Stencil Buffer.

 

Stencil buffer worked perfectly!! I ran into a problem with them clipping/culling strangely but managed to get it fixed after reading this! Thank you both for the help!