The monsters were speaking to each other.
Hearing their conversation, Gu Qing Shan realized something.
The monsters didn't think that he could understand what they were saying.
After all, for the entire Age of Old, no cultivator had been able to converse with the monsters, and no one had been able to understand their language.
Gu Qing Shan, on the other hand, received a lapis card from Little Dusk during the struggle for the 3 Divine Armaments that allowed him to understand Desolate Tongue.
According to Little Dusk, this was the common language for both the Divinities and the monsters during the Age of Desolation. The language was made to fall out of use by the Divinities, but because Little Dusk was a powerful weapon that was part of the main battle force against the Desolate monsters, the Divinities made her study this language.
Even now, not a single human understood this language besides himself.
Gu Qing Shan's mind quickly moved.