The construction of this Formation is extremely complex, clearly intended for some kind of evil ritual.
And that Black Crystal Stone is very likely the core of the ritual.
"What exactly are these Black-clothed Cultivators planning to do?"
Lin Wan'er asked in confusion.
Luo Qingchen was about to answer when suddenly he heard footsteps coming from the passage.
"Someone's coming!"
He quickly signaled the two women to hide.
Soon, several figures dressed in black robes walked in.
Leading them was a middle-aged man wearing a silver mask on his face.
"Is the altar ready?"
The masked man asked in a hoarse voice.
"Sir, the altar is ready."
A black-robed person answered respectfully.
"We just need to collect some more Essence Blood to activate the Formation."
"Very good."
The masked man nodded in satisfaction.
"The Spirit Vein here has good quality. If successfully transformed, it would greatly aid our cause."
Hearing this, Luo Qingchen's heart trembled.
