At sunrise, Lin Yun would swallow some Chaos Qi as per routine.
Cultivation is like sailing against the current; not advancing is retreating.
Besides his own cultivation, Lin Yun was also keen on teaching the ways of the Dao to the humans he and Qing Nu had created. Given that humans innately possess the Five Elements, compared to beasts that can develop certain attributes to the extreme, humans have a very difficult initial stage.
Because Lin Yun had set a principle not to interfere randomly with the progress of human civilization's development, such as helping them eliminate dangers just because they were in peril...
This was a trivial matter for Divine Spirits, but if they did it long-term, humans would have no future to speak of.