C563 Last Material

Time slowly passed. The new materials were becoming more and more uncommon, and there were more and more people who could not be identified.

"Dammit, what kind of material is this? I've never seen it before!"

"This thing seems to be steel, but it also seems to be iron …" "What is it?"

"It's over, it's over. I don't know this at all. I've already failed to recognize several of them