@Ett I have the same hypothesis, i think the real condition for his heart to explode is for him to reveal 100% of his real overpowers. Because in the magic test when the wand exploded he didn't died if only he use a bit or half of his powers, but he doesn't know that in the previous chapters.
Comment by Zero on Ett
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@Zero Why didn't he swing the sword correctly then? I mean, he could rank 8th in his class and his powers would not be discovered.