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To grasp power beyond one's level invariably requires a price to pay. The demonic qi released by Casio put an unimaginable strain on the bearer's body once it burst forth.
The more it is used, the fiercer, and the more urgently, the greater the damage to the user's own body. This is inevitable unless the bearer possessed a perfectly robust physique. Once, in the Era of Retrospection, the Magical Golem Sect boasted many such experts, but that was after about two years of development. The Magical Golem Sect that has just encountered transformation in the real world obviously does not have such conditions. So, Simonyi had to withstand the damage.
