In Age of Wonders 4, wall digging is a very important skill. It allows players to explore deeper underground caves and discover more resources and treasures. So the editor here has arranged wall digging skills for Age of Wonders 4. Help you dig underground caves and mine treasures more easily in the game.
To dig a wall in Age of Wonders 4, you need to be close to the earth wall. There is also a kind of dark wall that cannot be dug.
Strictly speaking, it is to turn impassable land into passable land. Sometimes there are random resources, sometimes there are wild monsters. In addition, there may be some underground ruins that require digging roads to reach.