The killer move activated by Star Lord Immortal Venerable was called Chaotic Intent Dream Scattering.
It was a Wisdom Dao Killer Move, yet it incorporated a great number of Dream Dao mortal Gu, thereby simulating Dream Dao power and allowing it to affect dream realms.
Star Lord Immortal Venerable had originally deduced this move to deal with Fang Yuan's dream realm methods.
Fang Yuan had once used Pure Dream Seeking True Bodies for self-destruction, forming dream realms to fight. Yet the vast majority of methods in the world were ineffective against dream realms, allowing Fang Yuan to repeatedly succeed.
Then, when Fang Yuan wanted to gather those dream realms away, he would use the Pure Dream Seeking True Transformation killer move to transform the dream realms into Pure Dream bodies one by one, taking them away together.
But under the Chaotic Intent Dream Scattering killer move, that was no longer possible.
The Dream Dao mortal Gu in the Chaotic Intent Dream Scattering killer move merely served as keys. The true method was Wisdom Dao.
Star Lord Immortal Venerable used Wisdom Dao means to interfere with the wills and emotions contained within the dream realms, throwing them into utter chaos.
Whether they were the previous Human Dao Dream Realms or the current Heavenly Dao Dream Realms, they all contained human will, human emotions, or heaven's will.
Once those wills and emotions became muddled and disordered, dream realms—especially orderly dream realms—would lose their order and become chaotic beyond measure. Gu cultivators exploring within them would suffer even more, like fish entering water, only to find that the water had been set ablaze.
Once a Pure Dream Seeking True Body was struck by this move, its stable humanoid body would revert to a dream realm. The human will, human emotions, and so on