Lind had underestimated his problem of reaching the Throne.
Gravity issues aside, he realized a sense of direction was nearly pointless in the Hollow Lands. He could tell where he had come from but he was unsure if he was going up or down anymore.
The 4th layer was not a planet. There was no ultimate center of gravity that would pull him in and then change directions. He learned quickly that Sovereign Tiers chose even the direction of that force!
He traveled for weeks in the mines before he finally felt a shift not due to any ore but it was to the relative right of what he thought of as his original down.
The quality of the stone changed as well. It was far more unstable earth and loose soil. Yet, he still found an open tunnel despite no smaller passages in range of his aura.
"Have I changed territories or is it some vestige left over?" Lind had no idea but a voice he had not heard in some time piped up.