Tens of thousands feet underground was a gigantic cavern and tens of miles-wide lava-rivers that had been rapidly flowing across the cavern.
Over tens of thousands tall and strong men, who had slave-marks branded between their eyebrows, were standing beside those lava-rivers with their bodies bared, scooping out scorching hot metal liquid from those lava-rivers with special, huge ladles.
The metal liquid, which was shining with eye-piercing lights, was ceaselessly flowing into a few gigantic smelting furnaces that were located tens of miles away, through some special metal channels. The odd-shaped furnaces were floating in the air. On the ground below the furnaces were fire-holes with a radius of a few feet, from which, cyan flame-pillars that had been transformed from the earth-flame were coming from the deepest area of the earth's core, and were spurting out of the ground. Those solid-like flame-pillars had been steadily holding those furnaces up in the air.
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