It's a primitive form of a Gigas. It's almost a cultural heritage, you know? Do you see the core storage section on the chest? It's not even an Iron Heart but a nuclear fusion core. It's giving me goosebumps.

"..."

Iron Heart was a state-of-the-art technology that had only been invented a few hundred years ago. Even so, it didn’t mean that the history of Gigas only spanned across that period of time. Without a need of looking far, Earth itself was a Stage II Civilization with a Power Suit that strengthened the users. In broader terms, that was also a primitive form of a Gigas, which was a common term used to refer to human-controlled Giants.

I had been working on the production which used Aura in the Unique World, while Ares was training my body in reality. At first, I wanted to create a Human-rank like Napoleon, or a Beast-rank like Thunder Dragon if I couldn’t do that much. However, that was just wishful thinking on my part, since even thoughtlessly desiring for a Tool-rank was difficult. Even if Albatross had hundreds and thousands of blueprints, I was not at the level that would dare to challenge it. I had just gotten into trying out production, after all.

That was why I made P-1 while referring to the Gigas of the past, which had the simplest structure possible....