After analyzing the situation, Chi Xue and the others didn't immediately give up the Outer Realm Stone and use it to shelter cultivators whose life force was running low. As a result, cultivators in their alliance still had to face their tribulations early whenever their life force began to fail. Not one of them had managed to break free of the Lord of the Universe's constraints, and their strength was far below Venerable Sword Saint's, so they could barely affect the Lord of the Universe. Even so, they could weaken him to some extent, which was exactly what Chi Xue and the others wanted.
As they cultivated, Chi Xue and the others also kept an eye on Ling Tian's side. They weren't only watching to see whether Ling Tian and his companions made breakthroughs in their cultivation; they were also looking to see whether anyone there had faced the Ultimate Lightning Tribulation. It didn't take long for them to realize that no one around Ling Tian had undergone a tribulation. This made them even more certain that Ling Tian had given up an Outer Realm Stone and used it to shelter his cultivators. Chi Xue and the others knew some of the cultivators around Ling Tian fairly well. They knew that several of them were already facing the problem of dwindling life force. Since so much time had passed without them choosing to face the Ultimate Lightning Tribulation, they must have been sheltered inside the Outer Realm Stone. This further suggested that Ling Tian had come up with the method.
Ling Tian's choice offered Chi Xue and the others little benefit. After all, they wanted more cultivators to face the Ultimate Lightning Tribulation. The more people who underwent the tribulation, the greater the impact on the Lord of the Universe,