"Roar!!!!!"
As the golden Godzilla in the sky let out a tremendous roar, the demon army on the ground came to a halt before an exceptionally massive Iron Fortress. The Iron Fortress was so majestic that, from afar, it resembled a giant mountain a thousand blades high. It stood near Lake of Molten Iron, which looked like a chain of naturally white-hot furnaces filled with molten iron.
This was Ferrug. It had once been an important supply base for demons. As everyone knew, demons had little talent for creation—they could not mine, much less forge—so this lava lake had become their natural weaponsmithing base. Like scooping water, demons ladled molten iron from the lake and poured it directly into molds to set.
It was simple and fast. Though crude, the molten iron from the lava lake was of superb quality, so even weapons forged in such a basic fashion were highly practical. More importantly, over countless years, Ferrug had supplied innumerable demon legions interested in gathering usable iron to construct other Iron Fortresses. It could be said that Ferrug was the mother of the Iron Fortresses on the Plain of Infinite Portals. Without it, demons, who had little talent for construction, could never have built Iron Fortresses across the Plain of Infinite Portals.
For that very reason, Ferrug had become the most important Iron Fortress on the Plain of Infinite Portals. And because it stood very close to the connection between the Plain of Infinite Portals and Avernus, its strategic position was also immensely important. Long ago, it had always been the front line in the war against devils.
The former owner of this Iron Fortress had been Solam's old acquaintance—Demogorgon. Back then, Demogorgon had once used this place as his command center in the Blood War.
During the era