What would happen if Muzan had a son before becoming the demon he was? Well Roku was born from Muzan and a women Muzan slept woh before he became a demon. Once he is born Muzan adopts him and chooses to turn him into a demon once he reaches he age of 18. Roku is the strongest demon aside from Muzan but he hopes to become stronger than his father. This is the legend of upper moon zero the son of Muzan.
Roku pov
all I could see is darkness, everywhere I look it's only darkness even when it's supposed to be light. I could hear nothing, feel nothing only this unending darkness that was surrounding my entire being.' What happened, I had just finished the mission Muzan sent me on'.
Before I could do anything else the darkness began to enter my body. I was experiencing Pain like I had never felt before. My entire body was burning, my bones were cracking but I could feel something. I could feel my blood,I could move it and transform it into anything.
' So that's my ability. Huh. '
' I can control and manipulate every aspect of my blood'. I then felt more powerful than ever before. I could feel pure power flowing through my veins. My body was then jolted awake by something from the outside. When I saw my father I no longer fe;r fear like before. " I'm now a demon".
"Yes that's right. You completed your mission so I rewarded you with my blood you should feel happy." Before father could say anything else I felt a massive hunger coming from the depth of my stomach.
My entire body felt weak and yearned for something to sustain it . " agh so hungry" I immediately began running following my senses and going towards the nearest settlement senku city. I went through the path I had just been to and finally arrived at the all to familiar city.
before anything else could happen I saw a young girl aged around 7. She had long black hair huge black eyes trimming with life.
She looked at me and said" mistew I lost mummy, Aaaaaagh' she begins to cry as tear fall from her eyes. " don't worry you'll be fine" I then took my hand out and plunged it straight through her chest. I took out her hear with my bear hands but this time the aroma was enticing.
The smell coming from the raw heart caused my entire body to salvate and before I knew anything else I took a bite. I saw people surrounding me with swords ready to kill me and stop any more deaths from happening but I couldn't care about them. ' this taste, I've never tasted anything like this, how can it be this good' I then swallowed the entire heart before pouncing on the people near me.
They tried blocking me with their swords but I simply broke it with my strength. I snapped the sword of the tall samurai in front of me and continued my amazing feast.
I didn't use my primal breathing as I wanted to get used to my strength first. I pounced from person to person with pure ecstasy in my eyes as I continued my massacre.
I ripped through people with my hand like they were nothing but butter and I continued to do this until there was no one near me.
I then went to the rest of the city to continue my slaughter
' this feeling it's amazing, I just want to slaughter and slaughter until there's nothing left. "HAHAHAHAAHA HUMANS YOU GUYS ARE WEAk" I then continued killing and killing and killing until there was almost no one left in the city.
Wanting to try my new abilities I kept 10 people alive hoping to experiment on them. I manipulated the blood in my body to exit and commanded it to stab the first person in front of me. As I thought of it the blood instantly rushed out of me and killed the man in front.
"plll ease le t us wive" he barely manages to stutter through that sentence before urine fills the air. "Sorry I can't do that" I then let a bit more of my blood fall but I begging thing of what I can do with it.
'What if I command it to burn' just as I said that my blood immediately begins to burn causing a massive fire and because it's still my blood I can control it.
" Amazing" all of the innocents watching look at the fire in horror as the get on their knees and begin begging me to let them live. I then command my blood to burn hotter and faster as most of the people get burnt alive.
" it smells amazing in here, hahahahahah" I then look at the last man that remains alive and feed him a portion of my blood. I command the blood to control him.
I then feel that the blood in his body begins transforming into parasites that begin to take control of his brain and his entire body. The man who has black hair and pale black eyes awakens as a new being takes control of his body. " </b>my lord you called for me" </b> the man replies in a screechy voice that seemed otherworldly. " I will name you nue come with me you will be my right hand man".
Me and nue then proved to walk back to the mansion where father was waiting.
I walk back to the mansion looking at hue who was getting used to walking as he had just been born. As I reach I see Muzan looking at me in confusion as he wonders who the man behind me is.
" Father I can control and manipulate my blood so I turned my blood into parasites who now reside in this body. Their called nue " I see a look at fathers face that I had never seen before a look of pure and utter confusion.
" son you left before letting me explain the basics of a demon. You need to eat humans, which I see that you've already done and you can't go out in the sun or you will die. Now come rest the sun will be coming up soon"
I follow father inside the mansion so we can continue our discussion. It's a massive mansion with all sorts of designs and at the front is written the word ubuyashiki.
" father can you give nue some of your blood I need to see if the corpse will turn into a demon or if nue will". Father than releases some of his blood and feeds it to nue. It's body begins to morph and change and I can see that all of the parasites inside it got combined into one singular parasite. I then feel that nue begins to create more parasites that merely as as bodies that follow its will with only one parasite truly being im control.
The main body of nue then creates more clones of itself and goes into my body hiding from Muzan's knowledge.
I then feed nue an arm that I was saving for later and get prepared to ask him what his ability is. " so what can you do". Nue looks into itself getting ready to answer"<b>my ability before becoming a demon would allow me to take control of others and I can still do that by sending a parasite into their body. My ability , it's easier if I just show you"</b> we then begin walking into the basement as nue needs space for his ability and he doesn't want to destroy the inside of our mansion.
I see hue drop a bit of his blood before m]saying "<b> demon blood art yiggdrazil</b>" immediately afterwards the blood begins to grow into a massive tree with a single mouth at the top. "<b> watch what'll happen" </b> nue than walks up to the monstrous tree and offers itself to it. As that happens the tree eats nue and from five of its body I see perfect replicas of the body it was just in being formed.
" <b>I can summon a tree which eats me and begins forming replicas but each replica takes days to form and depending on the strength of my current body needs a certain number of humans. I can also only summon one tree at a time and get severely weakened if the tree gets destroyed"</b> with this one ability we can make an army. " father did you hear that we can make an army. Isn't that amazing" before I could say anything else father immediately foes towards the tree and destroys it. He then destroys nue.
"WHAT DID YOU DO THAT FOR"
" I can tolerate you being out of my control as my son but I can't tolerate anything else not being in my control" my mind sesthes with rage as I see what father just did. ' it's fine I have nues main body in me' I then leave the manner and prepare to build another hide out where I can hide hue until father realizes he's more valuable then he thinks.