Ling Chou and Chu Ying had very much wanted to accompany Ling Tian through the tribulation. They knew, however, that although their cultivation realms would definitely reach the peak of the Near-Saint Eighteenth Heaven, or even surpass it by a good margin, by the time Ling Tian and the others underwent their tribulation, they were also confident they could safely break free of the Lord of the Universe's restraints during the tribulation. After all, they were people chosen by the Lord of the Universe too, and would not be killed so easily. Still, they knew Ling Tian would never allow them to undergo the tribulation alongside him.
The reason was that, by then, Ling Chou and the others would still be far from reaching the limits of their cultivation. In particular, they might not yet have taken the Phoenix Soul Fruit and undergone rebirth through nirvana. Even if they could safely break free of the Lord of the Universe's restraints and reach the Outer Realm, they would not be safe there. The Outer Realm was dangerous, and searching for Primordial Chaos Qi was especially perilous. At that point, Ling Chou and the others might not be able to help Ling Tian and Xiao Shi at all; worse, they could hold the two of them back. That was the last thing they wanted.
Besides, Ling Chou and Chu Ying knew they had an even more important duty: protecting Feng Lingzi and the other cultivators who had taken refuge inside the Outer Realm Stone.
Hearing this, Chu Ying nodded and said gravely, "That's right. Master would never take Master's wife and the others along when he undergoes the tribulation. And if we went with him too, Master's wife and the other seniors hiding inside the Outer Realm Stone would be in danger.