Supreme Giant Clam?
Cui Heng was slightly stunned when he heard this. He looked up at the sky and then looked at the black-robed man in front of him with interest. He chuckled and said, "Now that I'm fighting your Supreme Giant Clam, the outcome is still unknown. It's not the time to persuade me to surrender."
This black-robed man's cultivation realm had already surpassed the Sixth Realm of the True World and was above the Ancient Kings. However, he was clearly not as powerful as that monster and could not be compared to a Mid-stage Soul Formation cultivator.
Therefore, Cui Heng guessed that he might only be at the Seventh Realm of the True World. In comparison, the monster was equivalent to the minor Mid-stage Soul Formation realm which was the Eighth Realm of the True World.