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The Fission Technique was unfamiliar to those like Jue Yidao who were proficient in the way of the sword, but even among those skilled in spell techniques, not many recognized it. In any case, Wu Chi didn't recognize it, and neither did anyone else.
It's rather obscure and tricky, somewhat leaning towards the curse category, so not many people recognize it.
The Young Master, having learned from his family's deep heritage and having assumed the right posture from birth, had seen many masters and various techniques since childhood; he knew about the Fission Technique.
But knowing it made him realize that this obscure spell was difficult to cultivate and even harder to execute, with few capable of mastering it.
Of course, deep down, he also looked down on this technique.
