First step-Starling

Awaking from his sleep Muzan looks around with new eyes. The world looking so much finer, so much more defined than he ever remembers it being. His new senses feel strange to him but only in the way that they didn't feel strange at all. Although his previously normal senses were immensely stronger his body and mind seemed to have adapted to them instantaneously, he was more comfortable and intune with his body than he ever had been before, it was like he was given the last piece of a puzzle his body had long since figured out. His, now perfect, ears twitched for a moment as he heard the sounds of animals and dying men around him. His stomach, no not his stomach an instinct seemed to growl as he thought of the men dying outside and a hunger gripped his mind. His body trembled as he tried to fight the urge to run outside towards his mea-the men. His mouth salivated, his pupils dilated and previously nonexistent claws formed and sharped. He strained his muscles and grited his teeth, with enough strength to crush cars, trying to stop himself. He'd never admit it but it was a battle he was slowly losing. Thankfully a voice cut through his thoughts and snatched his attention away from his hunger.

Kokushibo- "My lord, All the men that were trying to attack you have been dealt with."

Muzan- "Tha-That's great Kokushibo, bring me the bodies, I'm starved."

Kokushibo- "Understood sir."

Kokushibo vanishes, and Muzan releases a shaky breath.

[ Hello again boy-o, looks like you've found your serum. Way faster than I thought you would too, lost a bet to Chaos because of that you dickhead. Anyway here's your system, luck be with you. Peace out Bitch.]

{ Demon King System

1.You and all your followers get stronger every kill you do, follower kills count as only 1/10 a credit.

2.Certain numbers give more powerful boosts things like evolutions and loss of weaknesses. 1, 10, 100, 1000, 10000, 100000, 1m, etc.

1 kill- All 12 moons, active during the start of the Manga Demon Slayer, added to world. Upper moons 1-3 brought to your location, rest scattered all over the globe.

10- Mental radar and Infinity Castle, once with in a mile of an undiscovered moon you will be able to track them down. Domain you and every discovered moon can access with your permission, Also gain the Biwa player demon.

100- Removal of Wisteria weakness and Sunlight resistance, Demon king-12 hours of sunlight, Upper Moon 1-8 hours, Upper Moon 2-6 hours, Upper 3-4 hours, Upper 4-2 hours, Upper Moon 5-1 hour, Upper Moon 6-30 minutes. All Lower Moons are only given 5 minutes of time.

Current kills-|101| }

After that information dump, and about 10 minutes of trying to calm down and not fanboy over being Muzan after WAITING FOR MONTHS!!! Muzan comes out of his thoughts to him biting into a dismembered leg, before his human side could recoil in disgust his demon side devoured the leg and those feelings as overwhelming euphoria flooded through his body. He will never admit it but the taste did cause him to moan, just a little. Muzan went into a frenzy moments later, his form changed into his combat form as all of his, now many, mouths devoured body after body. He even sprinted at max speed in and out of the lab, collecting and eating every one of the 90 bodies only after that did he return to his senses but by then his demon physiology had already changed him too much for him to care, not that he'd ever notice.

Muzan stared down at a well lit camp, pooled with guards and soldiers all of whom would die for their mission. It all disgusted Muzan, he could truly not fathom a reason for anyone, anyTHING, to die for a simple sum of cash or for a "mission" put onto them by their "superiors" but it mattered little to him, they were all going to die by the hands of his demons soon anyway.

Muzan-"Kokushibo, Doma, Akaza."

All 3 Demons-"Yes Master Muzan?"

Muzan-"Doma, Akaza, Slaughter all the soldiers on the Island, kill the ones in camp then find their designated routes and finish the rest off, be quick and quiet about it. Understood?"

Doma and Akaza raise slightly from their prostrated positions as they answer-"Of course lord Muzan!" the two then vanish from view as they begin to clear out the encampment.

Muzan-"Kokushibo, I've sent you a mental image of a man who has something I need his name is Fyers and you will bring him to me unharmed, be careful not to wake him from his sleep while you do so."

Kokushibo nobs and leaves almost immediately returning with Fyer still in his bed asleep.

Muzan gives a nod of acknowledgement to Kokushibo as he turns back towards the camp, watching as Doma and Akaza shred through leagues of soldiers.