"This town is called 'Prototype'?" Eisen asked, surprised, and swiftly, Constant nodded its head in response. "Yes, that is what the name of this town used to be. And the reason for that is quite simple. This was the first town that was established using a Town Core, while also being the place where you used to test numerous ideas out. And here, you also started working on the concepts of 'Ego-Items', 'Magic Inscription', and 'Artificial Evolution'. Your research into Ego-Items resulted in us Core Guardians. Those that are outside of the castle may also have been constructed similarly, but they are neither connected to a core themselves nor are they connected to the Guardian and became Helpers, as I did." Constant explained, slightly flinching every once in a while when Eisen started fixing the 'stumps' that were its arm and leg, and the old man slowly nodded his head.