Here is the revised and polished version of your story with corrections to tenses, grammar, typos, and punctuation:
The following day, news about Jun Wu claiming to be a Grade-1 Array Formation Master spread throughout the city.
He became the laughingstock of the town, and many called him by various mocking names.
To the people, he was a disgrace to the Jun aristocratic clan.
Upon hearing the news, Jun Jiahao sneered in disdain. How could Jun Wu claim to be a Formation Master when he knew nothing about it?
Realizing Jun Wu was still delusional, Jun Jiahao couldn't help but chuckle.
"Let's go. He's just a retarded bastard," he commanded his entourage and prepared to leave Silver Star City.
His mission was complete, and as for Jun Wu, he had placed his men around the city to kill him.
Jun Wu, however, paid no attention to the gossip, as he was busy studying formations.
Now that he had a goal, he wouldn't waste his precious time on trivial matters.
At the moment, he was in the smithing room, working on inventing a new weapon.
Standing close to him, Elder Peng watched intently as Jun Wu forged the item.
Behind Elder Peng stood Jun Wu's two retainers, who were equally confused yet intrigued.
They all held their breath, waiting to see the final creation.
An hour later, after intense concentration, Jun Wu completed his forging and inscribed runes onto the item.
A bright smile appeared on his face as he held it up.
"Finally, I did it!" he exclaimed with excitement.
Seeing his enthusiasm, everyone in the smithing room looked at him in bewilderment.
"Young Master, can you tell us what this is?" Mao Yun asked in anticipation.
"Before I tell you, let me show you." Jun Wu picked up the device, opened a small compartment, and inserted a small spirit stone.
"Is that a Spirit Stone?" Elder Peng asked in shock.
"Yes," Jun Wu nodded.
"Is this weapon going to use spirit stones?"
Elder Peng couldn't believe his eyes. Who in their right mind would use a spirit stone to power a weapon?
Did Jun Wu realize how rare and precious spirit stones were?
Jun Wu understood Elder Peng's skepticism but didn't care.
If anyone from Earth saw the item in his hand, they would instantly recognize its lethality.
Using his knowledge of ancient formations and the Hundred Forging Technique, he had created the world's first Runic Revolver.
At the center of the training ground, Jun Wu stood twenty meters away from a wooden target dummy.
Holding his breath, he raised the Runic Revolver and pulled the trigger.
Instantly, the runes on the revolver lit up, and a powerful force shot out of the weapon.
Bang!
A hole appeared in the dummy's head, shocking everyone present.
"How could this be?!"
Elder Peng and the two retainers widened their eyes in disbelief.
Rushing to the wooden dummy, Elder Peng examined it closely to confirm the hole was real.
"My goodness," he exclaimed, turning to Jun Wu with an expression of awe.
Seeing their shock, Jun Wu grinned. "That's not all. Elder Peng, please step away from the target."
Quickly, Elder Peng moved away as Jun Wu raised the strange weapon again.
Bang! Bang! Bang!
Under the continuous barrage, the wooden dummy's head exploded into pieces.
Lowering the revolver, Jun Wu said confidently, "This will be the signature weapon of my organization. What do you think?"
"Can I try it?" Zhang Wei asked excitedly.
Jun Wu handed him the Runic Revolver, and everyone watched in anticipation.
Bang! Bang!
Zhang Wei was so mesmerized that he couldn't put the gun down.
"Young Master, I want one!" he shouted, exhilarated.
The feeling of standing still and shooting down enemies was intoxicating.
A week had passed since Jun Wu created the first Runic Revolver. After completing the initial revolver, he crafted three more and distributed them among his people.
Now, apart from their cultivation-based strength, they were also armed with revolvers.
Their journey to Mystic City had never felt more secure.
Under the cover of night, Jun Wu and his two retainers left the city.
Though they were equipped with Runic Revolvers and mortal-grade weapons, they didn't want unnecessary battles and chose to leave quietly.
Before departing, Jun Wu had created a camouflage formation at the entrance of his mansion.
Moving silently through the dark streets, Jun Wu and his retainers slipped away unnoticed. The camouflage formation shrouded their departure, leaving the assassins convinced that Jun Wu was still in the mansion.
Outside the city, Elder Peng was waiting with a carriage.
Quickly, Jun Wu boarded the carriage, and they departed while their enemies still thought they had him cornered.
As the carriage rolled along the quiet road, Jun Wu glanced back at the dimly lit city.
This isn't the end. When I return, I'll make you all pay with your lives, he thought, gripping the Runic Revolver at his side.