A little help here, please.

A little help here, please.

First of all, Greetings to all and thank you for your time

I'm making a map, and I didn't wanted to ppl to see the ending of the map or the areas they didn't yet explored, so I tried putting a black mask area (Never explored / unexplored parts of the map), but the black mask isn't really all black, you can see the terrain (not the units)

I wanted to know how can I make the black mask actually be all black not letting you see anything.

I know its possible, Just dont know how...
Can anyone help me with that ??


Well, Thanks in advance, an answer will be much apreciated.

black mask is all black, except if u have a fog then u can c the shape of hills, thats all. u probably use fog of war, which is shadow and doesnt show units, but does show the rest