The thunder came unexpectedly. Although the two golden arhats from the Black Ancient Temple weren't dead, they were severely injured.
After all, even though it was just a clap of thunder, Fang Jinyu's lightning-attribute cultivation base was all included in the simple "thunderbolt!"
The power of lightning was extremely destructive, but that didn't mean that it had to cause a huge phenomenon.
For instance, the "thunderbolt's" cause of thunder didn't really result in much of a phenomenon, but when it sounded, it imprisoned their five senses, constrained their magical power, and even destroyed a portion of their divine senses.
Mu Anjie and Tan Yinsi had broken through the Nascent Soul stage, so they could transform between virtual and reality, and gather and disperse freely. Otherwise, they would have died without a doubt!