Back then, Ling Tian's clone had broken free of the Lord of the Universe's restraints even earlier than his true self. The clone had escaped through the opening in Shi Tian's Small World, so that place was very likely the Lord of the Universe's hiding place. If they arranged for some people to surround it in advance, then attack after Ling Tian fell out with the Lord of the Universe and they fought, they could pose a tremendous threat to the Lord of the Universe and greatly ease the pressure on Ling Tian.
Even if that wasn't the Lord of the Universe's hiding place, it was surely one of his weaknesses. After all, cultivators could attack the Cultivation World directly through that opening. This could have a major impact on the Lord of the Universe's universe, forcing him to divert his attention to defending it. That would naturally lessen the universe's suppression of Ling Tian.
To keep Shi Tian from recklessly returning to the Lord of the Universe's universe through that opening, Ling Tian had made arrangements as well. He had repeatedly warned him not to act rashly, and he had also told Shi Tian to move together with Chi Xue and the others. With their advantage in numbers and greater overall strength, Chi Xue and the others could keep him in check.
Next, they had to decide how many cultivators to send to the opening in advance. If they sent too few, they naturally wouldn't be able to have much of an impact, and their plan would be ineffective. But sending too many would weaken Chi Xue and the others, leaving them unable to pose much of a threat to the Lord of the Universe's true body. So the number they sent mattered greatly.
Ling Tian didn't make the