Wire
"Just what is this place?" Vaner muttered under his nose as he looked around the room.
But the place that he found inside the mountain couldn't be called a room at all. More than that, it looked like a massive, circular corridor, likely spanning the entire circumference of the mountain.
To Vaner's back, there was the same kind of wall that resisted his attacks before. And as far as he could see, a majority of the corridor actually consisted of both the same material and the same pattern written all over it.
'Those are walls,' Vaner thought, gulping down his saliva.
He came looking for silver but found gold.
Because a technique to create walls that sturdy and on such scale... didn't exist anywhere in the world.
"But just what in all hell is this thing?" Mathew whispered, turning his eyes towards a round object that made up the other wall of the circular corridor.