is it possible to make a place dark

[Shanghai]

i mean like is it possible to make a place dark like its always night there? with region palette or sumthing

 

[Squiggy]

make a region and put a black mask over it?

 

[Shanghai]

i dont have black mask do i need to do a trigger show me how to do it then thnx

 

[Squiggy]

Pick every Players in (all players) and do: Visibility - Create a visibility modifier region over *your region* emitting black mask for (Picked Player)

something like this