Area of effect markers

What Feature would you like to see included within TaleSpire?
What does it look like, how does it work, how is it used. Paint us a figurative picture.

This perhaps would act differently to props or creatures or building tiles. Could perhaps just be a circle of light, or a dome and cube. Would perhaps look and operate very similarly to the measuring tool but you would have the abiliity to leave the dome there. It would obviously be a little more transparent.

What situations would this Feature be useful?
Descriptions, examples, interactions with existing features - whatever you can think of to get your idea across!

It would be very useful when casting AOE spells that stay. for example a fog cloud, or zone of truth or entangle etc. Really useful for communicating to the players exactly what areas a being affected and more importantly REMEMBERING what areas were being affected.

Additional Thoughts/Details

Also pls add a cube to the measuring menu xo luv your product i had a blast dming my first session with it, players loved it and it looked awesome <3