He walked until the Middle Domain's light changed.
Not darkness. The self-luminous quality of everything in the realm meant that darkness in the Lower Domain sense did not occur here. The change was a shift in the ambient quality of the light, the emitted colors of the formations and the ground and the space itself moving through a range that corresponded to the passage of time in the same way that a day-night cycle corresponded to time in environments with external light sources.
He stopped when the quality shift was complete and looked at where he had arrived.
He had walked for a long time. Not at the pace of someone covering ground efficiently. At the pace of someone learning the ground they were covering, each step contributing to a developing understanding of what the Middle Domain was like to be in rather than to look at from a threshold.
