Northern was not sure how the Chaos Prince was able to create animate beings, but he had a guess.
He could see Chaos Constructs, which the Chaos Prince himself must have been able to comprehend at a transcendental level, of course.
Before, Northern thought that the Chaos Prince couldn't see or affect ligatures and their Chaos Constructs. He thought he was the first of his kind.
However, after what he saw in the tower and meeting these animate beings created by the Chaos Prince, he began to reason otherwise.
When the Void became a larger part of him than Chaos, and he gained the memory and understanding of the Void—not all, however—Northern now understood that there was more to the Chaos Prince than met the eye.
Now, Northern considered that the Chaos Prince himself could actually create Chaos Constructs. However, he also felt that the idea was too wild and overpowered.