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... had inherited Illya's Magic Circuits as they were, without creating his own magic first, then their nature would have still represented Illya's magecraft, which was mostly centered around familiars.
However, when Black comprehended Gradation Blood, the nature of those Magic Circuits changed. Now, in their entirety, they had torn themselves off their original nature, becoming Kai and Black's, as the Magic Circuits — or, better to say, the Magic Crest — were carved on one's soul.
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