A mole exists near High Lord Rashal.
Someone high up who could gain access to the information around Rex.
During his first encounter with High Lord Rashal, there were a lot of people who saw him in passing, but most of them were busy with their work. Only a few actually saw him and noticed that Vadyn was the one escorting him to meet with High Lord Rashal.
It was even less who knew where he lived.
Rex's penthouse was near the central point of Larta City, and although the neighbourhood was crowded with people, the spies were there to keep a lookout on him. People who most certainly had already been vetted properly by High Lord Rashal.
And they were alert.
Even Rex needed help in order to avoid the spies.
So, the thought of a passerby marking his penthouse is unlikely.
