Wall
Walls only block melee attacks, projectile attacks go over them. However, big and behemoth biters can attack 2 tiles away, meaning they can hit structures directly behind a single layer of walls. To prevent this, structures can be moved further back from the walls or a second layer of walls can be added.
Ingredients: 5× Stone brick
Output: 1 per craft → 120/min (single machine, no modules)
