[Just like the Profound Elixir Tier, the quality of Yin and Yang powers is equally important. Moreover, even more demanding than forming Profound Elixirs, the Yin and Yang quality must also be the same. Otherwise, if their intensities are different, the Yin and Yang balance will not be achieved, making it impossible to form a complete Yin Yang Diagram and thus leading to a failed breakthrough. A mild consequence would be the destruction of the Profound Pill, while in severe cases, the cultivator could suffer death.]
[Although it is not crucial for Yin and Yang powers to have the exact same strength, Yin and Yang powers of the same quality have different intensities. Powers of the same tier can still be combined, complementing each other and forming a balanced Yin and Yang. If their tiers are different and the gap is too large, they cannot complement each other, and one would devour the other.]