For Chi Xue and the others, finding out whether Ling Tian would join them in facing the tribulation was important. Naturally, it would be best if Ling Tian chose to face it alongside them. That way, not only could they benefit from the grand formation Ling Tian had set up—the Myriad Sword Demon Extermination Grand Formation fused with the Buddha Kingdom World formation—but Po Di and the others could also help refine it. Then, in the future, they would be able to unleash the formation's full power and have a better chance of breaking free from the Lord of the Universe's restraints.
It was just as important for Chi Xue and the others to find out if Ling Tian wouldn't join them. That way, they could have Po Di and the others start setting up the formation two or three tens of thousands of years in advance. With that much time, they had a chance to create a fine formation. Then, when they triggered the final tribulation alongside Ling Tian and the other cultivators, they would still have a good chance of breaking free from the Lord of the Universe's restraints. Perhaps the formation fusing the Myriad Sword Demon Extermination Grand Formation with the Buddha Kingdom World wasn't essential for Chi Xue and Po Tian, since they were certain to break free from the Lord of the Universe's restraints. But it was different for Shi Meng and the others. Without the Lord of the Universe deliberately going easy on them, they could only rely on their own strength or outside help.
By this point, it was naturally too late to improve their own strength, so they could only rely on outside help. The best aid for increasing their chances of breaking free from the Lord of the Universe's restraints was