The dual cultivation techniques born into this world all have their limits. Whether you pursue the path of mutual complement or absorption, if the other person's cultivation is higher than yours, you won't be able to absorb much in one go!
The terror of the Yin-Yang Harmony Saint Body lies in its limitless absorption!
Let's set aside the matter of Tribulation Crossing for now and just talk about the enhancement of cultivation through absorption. As long as the person engaging in dual cultivation with the owner of the Yin-Yang Harmony Saint Body is willing to give, the owner can achieve instant ascension.
To illustrate the difference between the Yin-Yang Harmony Saint Body and ordinary dual cultivation techniques, consider this simple example: if a being of Great Perfection of the Sacred Realm engages in dual cultivation with someone who has no cultivation level but possesses the Yin-Yang Harmony Saint Body, they can almost elevate the other person to the Great Perfection of the Sacred Realm overnight!