As the castle almost descended into chaos and Arad's incarnation approached the city of Rain at the border of the Chromatic Dragons' Star Mountain, his other clone was already resting at the peak of a mountain, waiting for the flying fortress of the metallic dragons to reach him.
While everyone was busy, Arad was the only one who could afford to have some time off, thanks to having multiple incarnations. So instead of just sitting somewhere doing nothing, he had sent this incarnation here to start working on his plan to visit the Metallic Queen.
From what Arad gathered, the Metallic dragons were at this time busy recharging the fortress, whatever that meant. He only knew that he couldn't just approach them currently, because the defense systems are set to high alert, and he would get shot if he approached.