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Emotion Magic, a magic so terrifying that it was banned in the entire of this continent and forgotten over hundreds of years. It seems to be capable of reading through the true intentions and emotions of others, making it easy to discern if someone had good intentions or not. By using this Magic, people was able to take better decisions to who to make allies, but because nobody ever had good intentions with the other most of the time, it caused more conflicts than anything, and ended being banned by several of the dominant nations of the Gallatea Continent, I have no idea about it in other continents.
"So that's how it is. You were able to read our hearts. Is that why you told us everything so quickly?" Wondered Nepheline, asking rather directly.
Check "The Protagnist's Sister Is Actually the Strongest"!