Another thing to think about is the fact that we aren't dealing with reality here; an evil human would likely not engage in any of the verbal histrionics that movie and tv villains do, let alone mythical entities. I mean, raid and dungeon bosses just stand around waiting for us 90 % of the time, you'd think they would have more to do than stand at attention waiting to be attacked. So with that level of absurdity happening, the way that they talk isn't a huge concern in my opinion.
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