The item suppresses Taichi's overwhelming "cheat" powers, forcing him to fight on equal footing using only his physical skills and his new katana.
While testing their new gear at the training grounds, Taichi begins to feel ill—the result of overindulgence during the victory celebrations—and heads into town alone to find medicine. The Confrontation with Cassim Isekai Cheat Magician Episode 10
Taichi, who has had relatively little formal training compared to seasoned veterans, must rely on his instincts and the inherent power of his new blade. Isekai Cheat Magician Episode 10