When Northern became the Master of the Tower of Trammel, he inherited the memories of all other Tower Masters.
Yes, from that moment, he already knew how he was going to travel out of Stelia. It was the reason why he took such measures to go to the Luinngard Empire.
He bothered asking his mother for help because he didn't want to cause a scene. The moment the Tower appeared, every eye was going to be on it.
However, thanks to the chaos Raven had wrought in this nation, people didn't seem to have seen it; perhaps many were busy looking for a way to save what was left of their homes and lives, placing petitions and waiting on the Emperor to tell them what exactly went wrong.
Even those that probably saw the structure were not blessed with the luxury to care.
Which, on one hand, worked to his own benefit but didn't make what Raven had done any more tolerable.
