Duke maintained this state, like a tireless combination of a tunneling machine and a refinery, moving along the richest main artery of the Sea Heart Iron vein, consuming everything in its path.
Vivian stayed inside this mobile golden sphere, watching the scene in awe.
She could see the blue ore walls around them disappearing rapidly like they were being devoured by an invisible giant beast, replaced by solidified ordinary rock walls.
They were deep underground, frantically plundering the vein in an inconceivable way.
This process was extremely efficient, far surpassing any mining method by a thousandfold.
Deep underground, wrapped in yellow sand, Duke and Vivian were like an efficient and greedy devouring beast, crazily advancing along the richest main artery of the Sea Heart Iron vein.
This process also caused devastating damage to the surrounding geological structure.
