Extra Chapter 10.5: Without Saitama
The gigantic ship had landed upon the ruins of a city which had stood there just a minute before. Out of the single remaining building came 18 heroes on a mission to enter the ship and eliminate whoever was in charge of the invaders. They were doomed to fail.
The vast army of Metal knight had been whittled down by constant back and forth barrages with the weaponry of The Dark Matter Thieves and although the heroes had broken through Metal Knight now only had a single combat drone left. Already these aliens were the strongest of all known threats and the alien in charge was incomprehensibly stronger. At last after defeating Boros' lieutenant's the heroes came into the grand throne room. Boros opened his mouth to greet the heroes but was immediately hit by a blast from the impatient Genos. From out of the smoke the alien overlord shot forth a column of energy at the huddled bunch of warriors. "So you just want to get to fighting? I can respect that." This complement didn't reach the ears of the overwhelmed heroes as almost all of them were burnt alive. Even Darkshine had been incinerated by the extreme heat of Boros' energy. Only Blast,Tatsumaki, Flash, and Bang had managed to dodge the blast which Boros had purposely tempered in order to spare his opponents.
"Light Speed Slash!" Roared Flashy Flash as he sped along the hall alongside Bang. Both of the heroes were reduced to bloody mist with a singular sweep of the hand by Boros. Looking over to his left he caught a flying piece of debris and threw it back at Tatsumaki. This single piece was overshadowed by the vast swaths of metal Tatsumaki was flinging with all her might. Again Boros shot forth energy and incinerated the wall of permium facing him. From out of the slag Blast came in with a thunderous punch that shot Boros against the wall. The diminutive psychic tried to tear Boros apart with all her might but couldn't even faze him. Boros decided to do away with the annoyance by firing an energy beam. Blast quickly turned to block the attack but found Boros had outsped his own blast and was now upon him. Blast was smacked away with a vicious backhand and caught himself on a pillar. He looked up just in time to see Tornado incinerated by a purple energy wave.
Boros looked over to Blast with a look of surprise. "Your punch had decent power and you took a punch without dying, perhaps you are the being of prophecy" he stated casually.
Blast tensed his fist with rage and shouted "You will pay for what you have done you monster!" With that he pushed off the pillar and collided with Boros, creating a great rush of wind. The pair bounced around the throne room creating cracks and dents in the permium from the intensity of the fight. Blast began to push forward with blood streaking across his face, he was putting every last ounce of his power into each of his strikes. Meanwhile Boros maintained his deadpan expression, was he actually bored by this unthinkable clash of titans? Blast unleashed a combo through Boros' lax guard and continued his beat down by pummeling Boros' into the side of a pillar and with a final mighty blow breaking the pillar and sending Boros's flying through it. As Blast huffed and puffed from expending all his energy the body on the floor rose.
Pieces of permium dropped from the armor which was now falling apart. Boros' muscular body had at last been exposed from beneath his wearable prison. He looked at the half dead Blast and said in a crestfallen tone "You are strong." A purple torrent of death was unleashed and as Boros released his full power Blast was vaporized just by being in the same general area.
The energy faded away as Boros calmed himself. It would be a hassle to rebuild the ship but what weighed more heavily upon him was the fact that nothing left in existence could even remotely challenge him.
"Prophecies can't be trusted after all."
Bonus: power scaling/threat levels
Boros chapter 1: Wolf
Boros chapter 2: Tiger
Xilbaf: Tiger
Boros chapter 3 and 4: Demon
Mafia members Durf/Ant/Phedo: Demon
Boros chapter 5 and 6 (This is the limit to Boros' power until he breaks his limiter): Dragon
Jungle Beasts: varying degrees of Dragon
Nandar the destroyer: Dragon+ (The same strength as Tatsumaki)
Goolin: Below Wolf