Additionally, it's worth mentioning that Su Yu's Chaos Pearl can gain 10 billion chaotic energy transitional experience and 100,000 cultivation points daily, which changes as he becomes an Immortal.
Before becoming an Immortal, it's true that it would improve his cultivation points and Dao significantly, but after achieving immortality, he no longer gains experience and cultivation points; instead, chaotic energy is gathered, one unit per day.
These two are essentially the same, just presented in different ways.
Chaotic energy is akin to the Power of Heavenly Dao and can be used to enhance one's cultivation and bloodlines or strengthen Heavenly Materials and Earthly Treasures and artifacts, though not as universally applicable as Heavenly Dao's power, as it can't strengthen Cultivation Skills or Divine Techniques.
