Then shouldn't there be some guardians who died in Medival times, or other old time periods? Would they keep the same manner of speaking they had? Imagine a guardian who addresses lightless citizens as peasants!
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Speech is influenced by people around you, they would probably speak that way for a while (even amnesia cant make you forget the most basic things like speech and simple survival instincts) Simple Psychology, not saying anything mean by it but its a basic in it that people are shaped bu their environment constantly