NHF – new heroes for Heroes V 3.1.

So, it will be similar to Ksuda.

Ksuda is a lighter version, so to speak. And there, on expert difficulty, the Earth Eye showed the map of the area (without buildings, neutrals, and enemies), artifacts, and resources with mines. On expert difficulty, the Air Eye shows all enemy cities, buildings, and heroes. For Heroes 5, this might be a bit too powerful for a spell, but it's perfect for a relic artifact.