Game Invasion: Summoners of Contract Moving Castle

[Game arrival + rebirth + summoner + infrastructure + farming + decisive killing] Gu Yu was reborn and returned to the earth one month before it was invaded by the game. Not only did he retain his summoner profession, but he also activated his god-level talent [Connection of All Things] - which can contract with all things in the world. At the beginning, he contracted a castle and transformed it into a mobile fortress to conquer the doomsday by fusing machinery and technology. While others are struggling to survive in the apocalypse, his castle has been equipped with solar panels, water purification systems, giant mobile crawlers... And transformed into a steel home; When the survivors form a team to avoid the monsters, they are already surrounded by goblin warriors, kobold warlocks, and fox-man alchemists... The contract increases with the level, and one person can form an army. And when the game finally comes and monster craze sweeps the world, Everyone looked up and saw the steel castle's tracks roaring, and the forts flowing with magical light. Gu Yu stood on the top of the castle, overlooking the collapsing world: "In this life, my rules govern this place."