The City of Ten Thousand Swords was filled with spell techniques that recorded images. There was one set up almost every few meters to constantly monitor the situation. It was just that they would not use it during normal times, and as long as they were willing, they could immediately and clearly investigate a person's whereabouts.
This was the harshest method to maintain the city's security, and under normal circumstances, it would not be used.
But today, the City Lord had gone to such great lengths to investigate a single person. Although none of the secret guards knew who this person was, the City Lord's attitude had already shown the importance of this person. They were the City Lord's shadow and followed the City Lord's will, so there was no need to ask for the reason. They only needed to execute the order.