Hello guys,
i want to reproduce that kind of fog of war seen in Heroes of the Storm.
Any idea?
No idea? 
Try searching the forums. There have been several posts on how to do fog of war, as well as several assets on the store.
I think I have misplaced the question, I would like to reproduce the effect that lies on the edges of maps (That kind of black shade), not just the fog of war, but I did not know how to call it.
I think it’s just a material applied to an object, but I don’t know how to reproduce it.
It’s a bit complicated, but first you have to sett up a fog of war system. make sure that works. now once you have that, make the “edge walls” game objects to have an identifier like a tag or layer, then in a script make those objects change the way they are rendered so that they are only black (maybe change the material) when they are outside the fog of war.
or maybe just create game objects that are pure black and put them in the scene 
Blizzard’s effects tend to rely on really good art more than any kind of advanced materials. I assume you’re referring to the purple smoke at the edge of the world there? Generally blizzard just uses looping animated textures for effects like that. Nothing necessarily special in the material, just some good art.
Otherwise if you mean the black geometry “outside” the view, that’s just exactly like I stated … geometry with an unlit black color.
Thanks!
And what about this effect? I suppose it’s a particular shader that only partially draws the object and applies a gradient of color, right?
That’s your standard fog of war.