Thayer explained. "Zones are made up of build-up of energies, right? Then there's a place where the energy is the most concentrated, the strongest. We call that the center. It's where monsters are brought here from other places."
From his spatial ring, he brought out an artifact; it's a round, smooth ball the color of the sun. "This is a Gold rank artifact." He said proudly.
They all looked at it. Jael tried to feel it with his senses, but the small ball remained still and silent; he felt nothing special from it. "What does it do?"
"It's a dungeon regulator. Just place it at the center of the zone and it'll regulate the flow of mana in that zone, controlling the amount of monsters that can come through." Thayer cradled the golden ball, this is the foundation of his Guild and it cost so much he winced from the memory.