Linglong Sect had a very different reputation from Blazing Fire Sect. It was a peaceful sect whose cultivators rarely ventured outside, and it had good relations with the surrounding sects. When Blazing Fire Sect attacked those small and medium-sized sects, Linglong Sect had even taken in some of the refugees.
Most importantly, someone in the sect was on good terms with Wu Ying. So Wu Ying, Wu Teng, and the other people from Mist Hidden Sect didn't want Ling Tian to force his way in and attack. They suggested that he exchange the Ginseng Fruit Tree for the Nine-leaf Ginseng, and they thought there was a good chance it would work. Though the Nine-leaf Ginseng had an extremely powerful healing effect, many cultivators could easily recover from physical injuries and didn't need it. At the very least, to Linglong Sect's cultivators, this Saint-grade Heavenly Treasure was far less valuable than the Ginseng Fruit Tree.
In other words, if Ling Tian offered the Ginseng Fruit Tree in exchange, there was more than a ninety-percent chance Linglong Sect would agree. That was the basis for Wu Ying and the others' suggestion.
Of course, Ling Tian took their advice seriously. In his mind, it would be best if he could obtain the Nine-leaf Ginseng without resorting to force, so he immediately agreed to Wu Teng's proposal. He then asked Wu Ying to contact Linglong Sect and explain his intentions.
When he learned that Linglong Sect's cultivators were exceptionally skilled in formation runes and restrictions, Ling Tian felt a flicker of anticipation. He planned not only to teach them the formation runes and restrictions of the Myriad Sword Demon Extermination Grand Formation fused with the Buddha Kingdom World, but also to pass on the soul restriction the Lord of the Universe had taught him.