After the mines were finished, the experimental replica decided that mines were too dangerous to leave lying around on your property. What would the authorities think after all? Since he had no desire to be arrested whatsoever now or any time in the nearby future the mines would be sent away. The mines were not the solution but it donned on him what was the solution, a variation of what one of his templates could do, those explosive black marks of Assassin. Explosions however were not what he wanted and those wouldn't get the job required done anyway.
Ooh wait, it had just hit him. So he began to draw the symbols out of his own power and let them be engraved into the ground. The symbols were etched as enchantments into the ground and made to be sustaining themselves. They would not drain his magic this way and it would be easier anyway, but he had maintained control over what he had made. Later many other technologies would be added to his place, and other defenses as well. Once that was done, he walked back inside to order something to eat.