Indeed, it was a millstone! That was the bone-chilling Yin-Yang Great Millstone. This was a newly developed ultimate technique by Laozi, inspired by the terrifying World-Destroying Great Millstone of the Primordial World.
This technique contained endless Yin and Yang forces that intertwined and fused to form a formidable power capable of destroying heaven and earth.
When executing this ultimate move, the aura around Laozi turned extremely bizarre. The two qi of Yin and Yang swirled and danced around him like twin dragons, gradually converging into the shape of a massive millstone.
Chapter 196