The Supreme Light Martial and the Honorable Creator of Light jointly schemed for Yin Yang to manipulate the Heavenly Dao of the lower world, or even the Great Path; this is indeed a matter of cause and effect.
To help Yin Yang condense the Eye of Heaven's Dao, the Eye of the Great Tao, and finally the Eye of Hongmeng requires many tasks. Every intervention increases the resulting causal connections.
Moreover, when Yin Yang eventually condenses the Eye of Hongmeng, he is bound to devour the Heavenly Dao or even the Great Path of this universe. This kind of super-cause in devouring the Heavenly Dao and the Great Path is something no Divine Emperor can withstand.
Of course, the Supreme Light Martial and the Honorable Creator of Light, being Divine Sovereigns, are enough to suppress such power of cause, especially since they, being supreme-level powerhouses, also possess top-grade treasures that suppress destiny.
However, they have it, but Yin Yang does not.
