Dark square instead of hide volumes

What Feature would you like to see included within TaleSpire?
Having a dark square as an option for fog of war. It would work just like hide volumes, but instead making the selection invisible, we would have a dark black square, which we could easily turn off by one click

What situations would this Feature be useful?
Coming from tabletop simulator, I use black squares to hide rooms the players cant see. As soon as they enter, i delete that square, thus revealing the room. It’s much more elegant than the hide volumes, in my opinion.

Additional Thoughts/Details