After analyzing the situation, Chi Xue and the others decided that Ling Tian and Little Squeak were unlikely to use the Phoenix Soul Fruit to undergo nirvanic rebirth. After all, a mere hundred thousand years would not be enough for them to fully benefit from the fruit. At the very least, their strength would improve only marginally during that time. Since that was the case, Chi Xue and the others would not use the Phoenix Soul Fruit for nirvanic rebirth, either. They didn't want to waste it. To them, improving their strength as much as possible and then breaking free of the Lord of the Universe's control was more important than killing Ling Tian and Little Squeak.
That made sense. Even if they failed to kill Ling Tian on this last chance, it wasn't certain that Ling Tian and the others would kill them. They had great confidence in their life-saving methods. But if they failed to make the most of the Phoenix Soul Fruit and improve their strength, they were very likely to perish in the final tribulation. That was more likely than being killed by Ling Tian, so of course they wanted to make the best possible use of the fruit to grow stronger.
And the best way to maximize the Phoenix Soul Fruit's effects and improve their strength was to wait until their life force reached its limit before using it for nirvanic rebirth. As things stood, the best time to use the fruit was still a long way off.
Besides, Chi Xue and the others believed they had a good chance of killing Ling Tian even without using the Phoenix Soul Fruit for nirvanic rebirth. Venerable Sword Saint was still stronger than Ling Tian and Little Squeak, and that would remain true even a hundred thousand