Every kingdom was unique.
It was something that Long Qian Xing had realized from the very beginning and also the reason why he would always conduct investigation whenever he had to face against someone new.
There will always some kind of surprise that he experienced.
He himself also had knowledge regarding these kind of weapon, but he definitely couldn't design them. Even though he knew the basic principle, he didn't know the precise number necessary to make it.
It would require a lot of trials and error plus time.
Time that Long Qian Xing didn't have.
After thinking for a while, Long Qian Xing simply taught the basic methods to make it if it was necessary. Even if the result was not up to expectation, it was still useful from time to time.
But of course, he didn't use it too much because it was not that effective.
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