Spoiler: The Qualitherate Wizard
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I really like the flavour of this but I think the later abilities move further from the flavour. It goes from the Arrival-esque idea of 'languages can shape perception' to "You speak Mind Flayer so youre more abberant."
What if for the 10th level, they get to keep one spell slot they can cast open, and spontaneously cast something during the day, because when they will have prepared their spells tomorrow, they knew what they needed today? Just to stay on-brand. And having the highest level ability of a language based class remove the need to actually...speak seems off too. Maybe just the Telekinesis Somatic thing.