Outside, after the three of them approached the fog, they looked at each other and tacitly separated. They started advancing in a triangular formation.
The old woman with the highest cultivation level walked in front. She made a hand gesture to slow down and stared at the fog warily. Her walking stick hit the ground a few times.
She released her Law Power which transformed into a group of small snakes. They swam towards the fog in different directions and probed the way first.
As soon as they entered, a sword light lit up for an instant, and the snakes' heads that reached in were cut off. Then, its entire body collapsed as it twisted, turning into energy and dissipating.