If Ling Tian struck first against the Lord of the Universe, Chi Xue and the others might not be able to significantly affect him right away and draw some of his attention, easing the pressure on Ling Tian. So Chi Xue and the others were certain of one thing: they had to strike first. They were convinced that once they attacked, they would have a huge impact on the Lord of the Universe and draw some of his attention. That way, he could no longer focus all his efforts on suppressing Ling Tian.
Chi Xue and the others believed their strength would force the Lord of the Universe to make a major effort to deal with them. Ling Tian would surely notice at once, and with his cunning, he would naturally think to seize the opportunity to attack the Lord of the Universe. Then he and Chi Xue's group could work together from within and without. This was undoubtedly their best chance to defeat the Lord of the Universe—or, rather, their best chance to help Ling Tian withstand the Lord of the Universe's cosmic suppression.
Once they realized this, Chi Xue and the others resolved to launch the first attack themselves. That meant they had to act before the five-thousand-year deadline Ling Tian had agreed upon with the Lord of the Universe. Someone suggested attacking as soon as Ling Tian finished laying down his formation runes and restrictions. They figured that even if Ling Tian's formation was enormous, he could finish it in one or two thousand years. That meant they could attack the Lord of the Universe two thousand years from now.
But Chi Xue said it would be best to wait longer. They would only be delaying things by two or three thousand years in the outside world,