Around this moment, the situation within the chasm around Night Mountain Hill changed. Rather dense demonic energy emanated from that chasm, and it scared the nearby Black Lake Sect's disciples patrolling that area.
When they saw that Demonic Ardor, they planned to use the talisman to alert their main camp. However, the demonic energy suddenly rushed towards them and caught their bodies.
The four disciples were immobilized as that Demonic Ardor enveloped them.
In the distance, Azaroth sensed this Demonic Ardor. He was startled because, judging by the density of this Demonic Ardor, he was sure it belonged to a Demonic Emperor.
His guess was correct then. The demon residing within that chasm was at the Demon Emperor Rank.
However, this energy appeared rather weak for it to belong to a Demon Emperor. Azaroth guessed that the Demon Emperor must be injured right now, and that's why it didn't dare to get out.