Forged Destiny [Book 7: Ch. 1, Ch. 2, Ch. 4]

I'd decided to travel as a Swordmaster today, less because I felt I'd need it and more because the tag of Hero garnered immediate trust from those we found, useful to avoid arguments or mistrust from people who really couldn't afford to turn down our aid. While no one in Ansel looked down on me as a Blacksmith, knowing the truth, those survivors from the burned down villages didn't have the same experience.

[...]

On the other hand, while I could stay in Swordmaster form for some time, sooner or later I'd feel the urge to revert, if it didn't happen on its own. I noticed that even now my Class had turned back to Blacksmith at some point without me realising it at all. I felt more comfortable as a Blacksmith, though as Pyrrha said, that might just be because I was used to it after living as one for eighteen years. Nineteen soon, I realised.

—Forged Destiny [Book 7: Ch. 1]



And I couldn't keep the transformation up anyway, so it wasn't like I could stay as a Swordmaster all the time.

—Forged Destiny [Book 7: Ch. 2]



"No, it's not that. I can't stay as a Swordmaster indefinitely," I explained. "It puts a mental strain on me. I can ignore it at first, but it builds up. Eventually, with or without meaning to, I switch back into a Blacksmith."

—Forged Destiny [Book 7: Ch. 4]