It was a small house that could dig up soil on its own, then use some alchemy potions from the jar to create gigantic stone bricks resembling concrete. These bricks were placed in designated positions by tracks for feet, with legs resembling cranes automatically raising and lowering them.
There was no one operating within the small house, just a few alchemist apprentices guiding the vehicle. From their brisk footsteps, it was clear it required no effort.
The Stelter Family built a colossal wall at the foot of the mountain, standing fifteen meters tall. First, three-meter-long, one-and-a-half-meter-wide, and one-meter-high stone bricks were placed three on each side, leaving a three-meter-wide gap in the middle. Then, metal blocks of the same size were added on either side of the concrete bricks, followed by a coat of paint on the outer wall.
