"Hmm, so that was it, huh?" Eisen muttered to himself in response to the 'Big Reveal' from Raziel, and the Angel looked at the old man with an involuntary sigh.
"That's it? What, did you figure that out already?" Raziel asked with a frown, and the old man just shrugged his shoulders in response. "Kind of, but not really. I mean, there's items here made by me, for example those blank cores over there or even this Core Helper. And those other mechanical figures you spoke about are probably also Helpers like that. And considering that some of the parts of the castle have been constructed like I would have done it, that made me guess it already. But you just confirmed it, so thanks for that."
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https://www.webnovel.com/book/15238973305579305/Demon's-Virtue