Trans-what? No, it's a transmutation. I analyse what the auto-mail prosthetic is made from, then break down those components and rebuild them. I mean, this does thin out the metal, obviously, so it isn't as strong but. It does the job.

[You know. When he doesn't encounter alchemists like Scar that just utterly destroy his arm. But these bugs don't seem to be using alchemy so he is probably safe from that? So far at least as far as he's figured.]