Without the Creation Divine Tree, cultivators' life force gradually dwindled over time. Ling Tian, Chi Xue, and the others were no exception. They could keep advancing their realms and then strengthen themselves through Bloodline Power, replenishing their life force endlessly. In particular, after they gained the ability to refine the Origin Power left behind when a Saint fell and rapidly increase their strength, they had even less reason to worry about this problem.
Moreover, after opening multiple Small Worlds, Ling Tian and the others could absorb the world's energy and convert some of it into life force. That meant they wouldn't need to worry about their life force running out and dying for a very long time.
Ling Tian and the others, along with the cultivators of the Sacred Heart Sect, didn't need to worry about dying from a lack of life force. Other cultivators in the extraterritorial star region, however, couldn't ignore the problem. It was especially pressing for cultivators in super sects with countless years of history. Most of those sects dealt with it in much the same way: they used powerful formations and restrictions to seal away such cultivators, or had them seal themselves away. Those cultivators thus became the foundations of their sects.
It made sense. Cultivators with little life force left had undoubtedly lived for countless years, and their realms—and their strength—were extraordinarily powerful. The longer a sect had been passed down, the greater its reserves of hidden strength. Super sects like the Mist Hidden Sect and the Dark Pavilion naturally had many such hidden aces. Some of them were even stronger than Wu Yi. If these super sects brought their hidden strength to bear, they would have the power to threaten the Sacred Heart Sect—especially with nearly the entire star region joining forces against