Celestial Lightning Domain

Suddenly, quite a few heads exploded in the crowd, raising startled cries.
The instant those heads exploded, a lightning rune appeared on them. Then they were instantly killed.
"A loose tongue causes trouble. Did you not know this? Those who insult others will be insulted back. Unfortunately, my time is precious, so I have no time to insult you back. Sorry, I can only kill you."
More and more heads exploded in the crowd as Long Chen advanced. This bizarre scene horrified the people watching.
When he had heard the first two people talking ill of him, he swept his divine sense through the entire city, recording who had been cursing him.
Long Chen was now settling accounts with them. If it was before, Long Chen might have let them off after killing the first two, but he was no longer able to remain as calm as before. His killing intent was especially provoked when he heard them insulting his brothers and lovers.
These people might not be skilled at other things, but their ability to infuriate others was exceptional. Sometimes, words left worse injuries than physical damage. They were even more difficult to endure.
More and more heads exploded, and people could only look on in horror. They quickly realized that the ones dying were the ones who had cursed Long Chen viciously. His accuracy sparked disbelief.
"What kind of domain is this?! Why can't we sense anything?!" exclaimed one expert.
They were able to feel the slightest trace of strange energy causing spatial fluctuations, but they were unable to sense the source. All they felt was an invisible blade that pressed against their necks. Some people were spared, but some weren't.
In truth, this was Long Chen's Celestial Lightning Domain. It was a technique he had gained insight into after cultivating the Celestial Lightning Body Blink.
He hid lightning runes throughout this space, forming an invisible domain. Within this domain, he could freely move to any of the lightning runes.
Later, he had changed this domain a bit, transforming the spatial runes into killing runes, making a powerful killing domain. It was just that he had never had a chance to test this domain before.
Having been infuriated by this crowd, Long Chen activated it, silently killing those people that had angered him.
"We were being used by others! It's not our fault!"
Pfft! 
An expert that had loudly cursed Long Chen was terrified at this sight, but his shout didn't save his life. He was still killed.
"I had no enmity with you, so why did you have to force me? Did you think that offending me meant nothing, that I couldn't do anything in retaliation? A person should cherish their life. If you don't cherish your own life, why should I cherish it for you? Is harming others in the dark very satisfying? Then go ahead and be satisfied."
More heads exploded and corpses collapsed to the ground. The other experts were all pale, not even daring to move.
Even Empyreans didn't dare to. They found that they were within an invisible domain, and their lives were in Long Chen's hands. If he wanted to, then no matter how they struggled, they wouldn't be able to escape death. They had finally experienced Long Chen's domineering terror.
He had essentially killed them all. A few had managed to slip away, but Evilmoon had taken Long Chen's place to kill them. Not one managed to run. Evilmoon said Long Chen was finally acting like a man.
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