Normally, artifacts would be found everywhere in the world. They could even be found underground, in a dungeon, or even in a forest. They were the leftovers of ancient civilizations that had inhabited the other world. However, there was always a fine line between artificial artifacts and genuine ones.
Rune Grandmasters called it Reality Gate; Arthur read in the library.
This gate serves to link the artifact to the real world, using mana to alter the world. The way to create this gate has never been found, causing the artificial artifacts to forever remain artificial, not genuine.