"Hmm..."
Sheng Tian saw long centipedes with a red carapace wrapped around the heart of every Sea Beast in the river. He recalled the pale faced man who seemed to specialize in forbidden Gu arts and immediately connected this to him.
One wouldn't need to be a genius to know what the centipedes are there for. They most likely served as a contract of sorts, one that kills the contracted if certain information was leaked.
Sheng Tian entered his own thoughts, not bothering with the Sea Beasts who were terrified of their fate. If he tried to forcefully remove the Gu without any knowledge, it might kill the Sea Beast, or worse, inform the devil worshippers.
"Sigh!"
Sheng Tian waved his hand and slave seals shot out, imprinting on all of their foreheads. With his powerful soul force, none of the Sea Beasts were able to resist in the slightest. Then he dispelled the Formations with a satisfied expression on his face.