A/N: Incase someone who knows about Jumpchain themes wonders why the MC doesn't purchase his perks, that's because i'm using Jumpchain Quest Mode as a basis for narrative efficiency.
A/N 2: For those who are curious about what style of System i am using for this story, it is directly inspired by the interface in Castlevania Aria of Sorrow for the Nintendo Game Boy Advanced.
A/N 3: Instead of the way the blood type qualities normally work in Demon Slayer/Kimetsu no Yaiba, for Lucas the system will count 5 "ranks" of quality each giving a different amount of XP.
D Rank: Gives 10 XP
C Rank: Gives 20 XP
B Rank: Gives 30 XP
A Rank: Gives 40 XP
S Rank: Gives 50 XP
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Previously in The Omniverse's Dark Lord:
We were introduced to Lucas, a young man who got killed by a group of religious extremists and, in his last moments, swore revenge against the god known as ORDER.
After dying, Lucas's soul was taken to CHAOS, the oposite force to ORDER, who offered him a deal.
CHAOS would grant Lucas anything he wants, the only condition being that Lucas has to spread darkness across various worlds to eliminate the influence of ORDER.
Upon accepting the deal, Lucas was given the Marvelous Dark Lord System, which would help him grow limitlessly as well as travel between realities while hoarding powers.
The first world Lucas decided to travel to being Kimetsu no Yaiba, where he took the form of an Oni.
Soon enough he was noticed by Shina Ogawa, an oni even older than Muzan Kibutsuchi and who also happened to rule Upper Japan from the shadows.
Originally a fragile and sick but kind hearted young maiden from the Heian era, Shina went through a procedure that turned her into a beautiful woman with blood-red slithed eyes and gorgeous raven hair that contrasted with her very pale skin.
Tho spending centuries as an anthropophage monster made her once loving heart freeze as she became the cold demon queen she is nowdays.
Shina decided to keep an eye on this strange new Oni that didn't smell like one of hers nor like one of Muzan's, so she took him in with her.
Unknownst to her, Lucas planned on making use of this to grow stronger, as he had the intention of dethroning both her and Muzan.
Chapter One Stats Recap:
[Name: Lucas D Marvelous
Level: 01
XP: 50 (30 Left)
Species: Oni (Kimetsu no Yaiba version)
HP: 150/150
MP: 300/300
STR: 15
ATK: 15
CON: 15
DEF: 15
INT: 30
LCK: 15]
Chapter One Perks Recap:
[Vivid World
CHAOS Hinokami
Food is Food
Pretty as a Picture
Eating Healthy
My Kin
Train the Slayer
Kekijutsu/Demon Blood Art: Hemokinesis]
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Chapter Two: Demon Leveling
It's been a few days since Lucas met Shina and was taken in by the "demon" queen.
He was pleasantly surprised when he found out Shina lived in a dark and cold Edo-style palace, which makes sense considering her name was also from the Edo despite her being born in Heian.
During those days, Lucas was able to eat enough high quality meals to level up to level five, and while his stats had a good increase he has still not gotten any new Perks, he does seem to be getting better at using his Kekijutsu however since he has been able to form more complex blood constructs, likely due to having his INT stat reach 150 when he got to Level 5.
Meanwhile Shina couldn't stop being impressed, when she first met Lucas he was not much more powerful than a regular low level oni, even tho he was at least twice as smart, but in just a few days his power seemed to have grown fivefold.
At this pace, Shina wondered if this foreigner oni could have the potential to eventually be her equal, and for the first time in centuries, her heart started beating again.
She even started watching when he was training new ways to use his Kekijustu, watching him form a blood sword similar to the nichirins wielded by slayers and learning that he seemingly had some basic swordfighting training, but clearly not to the level he could have been a slayer.
The queen kept getting more and more curious and intrigued with every new thing she learned about this unique Oni, she even noticed that while most Onis get their primary source of growing in power from consuming both the flesh and blood of their victims, Lucas seemed to gain more power from their blood alone than most Onis from the entire thing, while the flesh itself only serves to sate his hunger but not to make him stronger.
At this point she was almost starting to believe his claim that they were closer to zombies or vampires than to actual onis.
Despite his initial plan of playing innocent as a way to gain Shina's trust until he grows strong enough to dethrone her, Lucas had one thing that he forgot to account for in this plan.
He sucks at playing innocent, mostly because of how much he enjoys showing off now that he has something truly special about himself.
He even started developping small sub-powers from consuming blood, even if not enough to be considered Demon Blood Arts of their own, such as adhering to vertical surfaces to climb walls, tho he mostly uses it to stand upside down on the ceeling almost like a bat.
One thing most people would not notice about Lucas is how strong his commitment to thematics can be, so if he decided he is gonna have a vampire theme you can bet your ass he is sticking to it.
This decision likely was what made his powers develop in that way, tho he had yet to test his ability to turn others into his servants with his blood, especially since Shina was still watching him somewhat closely.
His stats at level five are:
[Name: Lucas D Marvelous
Level: 05
XP: 00 (120 Left)
Species: Oni (Kimetsu no Yaiba version)
HP: 750/750
MP: 1500/1500
STR: 75
ATK: 75
CON: 75
DEF: 75
INT: 150
LCK: 75]
[XP = Experience, HP = Hit Power (Life), MP = Magic Power (Mana), STR = Physical Strength, ATK = Attack Power, CON = Constitution, DEF = Deffense Power, INT = Intelligence, LCK = Luck]
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Akane Hakai was once the daughter of a wealthy family on Upper Japan, until she got transformed into an Oni mere three months ago.
With her crimsom hair, beautiful blue eyes and a body that looked like she came out of an ecchi manga or anime (tho those things are yet to be invented in this universe) you can say she looks just like RiasGremory from High School DxD.
Her Kekijutsu is one of the most destructive ones in all of Japan, allowing her to break down to an atomic level anything that her blood touches, and she was a natural manipulator knowing how to get victims by using her body and intelligence for it, so she thought dealing with this group of so-called Demon Slayers that suddenly surrounded her would be easy.
She just forgot that she had no experience in actual fights, as most of her victims were drunks who got so distracted by how she looks and acts that they didn't even notice she was a demon before it was too late.
So even tho the slayers were not particularly strong, they were still enough to handle her as they were well aware falling for her charms meant certain death.
Thinking she could rely only in her charm and Kekijutsu was a mistake she would not live to commit again in the end.
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The moon shines in the nightsky as a figure clad in black with glowing red eyes leaps between tree branches.
After all those days, Shina finally got her guard down enough to let Lucas go out hunting, and he could already sense his favorite meal (other than chicken stroganoff) at distance, a group of humans, maybe six or seven and their blood didn't seem to be the worst quality.
Luckly the System has a map feature, one that can guide him to the direction of whatever goal he has as long as said goal is to go from point A to point B.
To be more exact, the Map manifested itself as a trail of blue fire which guided him despite being unable to actually touch physical matter and energy.
Upon arriving at his destination, he opened a grin as he saw a group of what he assumed to be six random thugs wielding katanas surrounding a red-haired girl who looked badly wounded.
-She will probably be dead too soon so she won't be a good meal- Lucas muttered to himself as he would have to be satisfied with the six thugs. -Oh well... get snuck upon!
Sneaking behind one of the thugs, Lucas quickly disarmed and pulled him into the darkness to the top of a tree branch like a leopard and drained his blood leaving the body dry.
+20 XP
*Thump!*
The thug's corpse falling on the ground without a single drop of blood alerted his group that somebody was around.
-Another demon!- One of the five remaining thugs exclaimed as they turned their attentions to all directions.
-But if it is a demon...- Another thug looked at a taller and more muscular one, probably the leader. -Shouldn't it had devoured Masaru's body too? Why just the blood?
-Bloody Stream!- Lucas formed his blood into a whip using his kekijutsu and quickly lashed one of the thugs on the spine just the right way to make him lose the movements in both arms and legs. As Lucas got down from the tree all four thugs still standing could see his glowing eyes as his leather trench coat had a scent of bloodmary, the sound of buzzards could be heard as if they knew they will have leftover corpses to feed from. -Salutations~
-This demon...- One of them was about to attack but Lucas' blood whip was quick enough to break his arms and legs. -Agh!
-Two down, three more and i can have my dinner- Lucas chuckled as he changed his whip into a pair of blades, a longer sword similar to Sasaki Kojiro's Monohoshizao on his right hand and a shorter one similar to a Tantõ on his left hand. -Now let's make this showy~
A pair of shorter and more skinny thugs, likely the group's faster members, quickly appeared in front of Lucas and tried slashing him, but he blocked it with his dual blades.
-You have potential- Lucas praised before gaining a sinister grin. -Too bad potential won't help you against darkness itself~ Aerolite Rain!
The thugs didn't notice that not all of the blood Lucas had released was in his blades, as quite a lot of it was left in the air, split in particles too small for humans to see with the naked eye.
Those particles soon formed above the thug duo and hardened into metallic shards, falling into their joints as a way to imobilize them without killing.
-You are the last one of your little group to fall- Lucas gazed at the largest one. -Don't worry tho, i will make sure you are the first to become my meal~
-Tch, die monster!- The appearant leader dashed torwards Lucas, his sword looked more like a Claymore than a Katana. -You don't belong in this world!
Sidestepping to dodge, Lucas' grin never left his face as he knew this line, having to hold back the urge to reply with "What is a Man" as his instincts told him to.
-You know, in a few decades that line will be so iconic- Lucas said before slashing the thug's arms off. -Now it's time to eat~
Pulling his blood back into his body, Lucas sunk his fangs into the leader, quickly draining his blood before draining the other four.
+20 XP
+20 XP
+20 XP
+20 XP
+20 XP
Level Up!
[Name: Lucas D Marvelous
Level: 06
XP: 00 (130 Left)
Species: Oni (Kimetsu no Yaiba version)
HP: 850/850
MP: 1600/1600
STR: 85
ATK: 85
CON: 85
DEF: 85
INT: 160
LCK: 85]
-They sure gave a lot of XP for just random thugs...- That's when Lucas noticed the blades they were using weren't made of iron or steel. -Oooooh those were slayers, it makes more sense now. Huh they must have been very incompetent if they lost despite having a bigger number.
-You... are like me...- Said a weak voice as he looked to see the red haired girl who's wounds were slowly healing. -You're a demon too aren't you?
-Oh right if the slayers were after you then you must be an oni- Lucas turned to face the girl, and as he saw her with more detail he had only one thing in mind. 'Why the fuck does she look just like Rias?'
That's when the System finally showed some information on her.
[Name: Akane Hakai
Race: Oni
Description: Daughter of a wealthy family, she recently got turned into an Oni three months ago. She lacks any actual combat experience, usually luring drunk victims with her body and manipulation skills instead. Her Kekijutsu can destroy the affected targets at atomic level]
'Even her Kekijutsu is just the Power of Destruction... if she had any experience at all those weaklings would have been easy prey for her' Lucas thought before speaking at the Seductress of Ruin. -I prefer the term vampire but indeed, my name is Lucas D Marvelous.
-Akane Hakai- The girl introduced herself properly. -And your Kekijutsu... the way you used it... how did you control it so well? My own is much stronger and yet those slayers beat me so easily...
-A strong power is nothing if the user can't wield it- Lucas replied firmly. -My Kekijutsu may seem simple, but a real genius can turn even the simplest materials into weapons that could kill gods!
'He is... weirdly dramatic' Akane thought, it fitted the way he described himself as a vampire tho. -I see... how long have you been a dem-i mean, a vampire for?
-I don't know for sure, maybe five days or a week- Lucas shrugged as Akane's eyes widened, if that was true he was a demon for only a fraction of the time she did and yet he had such control over his power.
-Please take me with you!- Akane did what she never thought she would do, bow down and beg (usually it's men doing it to her not the inverse) as she needed to get stronger and he was her best chance. -I want to learn how to use my own powers to the degree you use yours, so please train me!
-Allright i will do it with one simple condition- Lucas' grin returned. -Stand still for a moment.
Akane thought that he would try to grope her or something similar, not knowing how purple he was about those things, so she got surprised when instead he moved her head slightly and...
-Neck Bite- Sank his fangs in the spot her left shoulder connects to her neck, what kind of demon attacks other demons? Especially since he just drained six humans dry? Lite did Akane know he was testing a theory.
And the theory was soon comproved.
+50 XP
For draining blood of an Oni, you have obtained a new Perk
Kekijutsu/Demon Blood Art; Power of Destruction: Blood, the (for you) delicious crimsom fluid that is the fuel of life. But what if it was also a weapon? Now you have the same ability as Akane Hakai, the ability to deintegrate targets touched by your blood to an atomic level.
As soon as he comproved he can do it, Lucas let go of Akane as the bite marks on her neck started to heal, he pulled away and, still grinning just because he likes to look spooky, looked at her.
-I got what i wanted, so it is just fair that i give what you asked- Lucas said. -Follow me, i will show you where i have been living.
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Upon taking Akane back to the palace, Lucas was somewhat surprised that Shina accepted letting her stay there with the condition of personally watching over whenever the seductress of ruin was around Lucas, since it would be risky to let him unwatched with another demon or something.
He did not mention that he can copy the demon blood arts of others by drinking their blood tho, or that just draining the blood of six slayers was enough to make him 20% stronger.
Despite everything him and Shina seemed to be starting to trust each other more in the last few days, at first he knew she was just being careful due to finding him an unpredictable wildcard, but now she genuinely seems to care despite refusing to admit it.
Lucas also finds it weird to have someone care about him but she was a literal demon queen so it makes some degree of sense that only other creatures of the darkness would enjoy his presence, and it gave him even more reason to continue on the mission CHAOS gave him.
After all, now that he has felt the cold embrace of the darkness he will never want to burn in light again.
'Maybe someday i will reveal to them where i'm from...' Lucas thought to himself while using his vampiric adherence to stand upside down on the ceeling.
Truth be told he was starting to actually enjoy Shina and Akane's company, even if the two seem to sometimes argue when they see the other approach him without warning.
During the next few days, Lucas helped Akane find her own fighting style, as her kekijutsu specifically needs her blood to touch a target that means she is limited to close range in comparisson to someone like Lucas who's control over his own blood grows the more he levels up.
He also taught her that it takes higher quality blood to actually get stronger as eating a lot of lower quality humans would only increase her body mass and nothing else.
While watching the two younger demons train, Shina noticed Lucas' blood looked different.
Not different enough that most people or even onis would notice it, but she could see that his blood had faint fleckles of dark purple, the same color of the flames created by Akane's blood when she uses her kekijutsu.
Lucas also showed a growing control over the basic ability every Oni has to control their own flesh, and while it was still far from the control he had over his blood with his Kekijutsu, he still could make his changes at a quicker pace and keep them longer than someone who has been a demon for only a week at most should be able to.
It was also very clear that his favored use for this ability was to form claws in his hands and strengthen those claws with hardened blood, a move he named Devil's Touch.
It's also important to notice that Lucas ALWAYS sleeps while standing upside down on the ceeling of his room during most of the morning period, with nobody being able to explain his adherence properly since it didn't use either his kekijutsu or flesh manipulation.
Lucas had the feeling that one day he would have to reveal the truth about his origins, but it wasn't time for it just yet.
After all, it's not an easy thing to explain you are from another world, got killed by religious extremists and turned into a jumper by CHAOS in exchange for spreading darkness across worlds.
In all honesty, Lucas was no longer sure about his initial plan of overthrowing Shina, instead prefering to target Muzan Kibutsuchi and the Demon Slayer Corps.
'I might turn a slayer into my... do they evn count as Thralls or Ghouls?' Lucas thought to himself, he knows that using My Kin he can turn others into servant members of his own species, and he knows that a slayer would be the ideal human to test it on since they tend to be stronger than untrained humans. 'I just need t find out which one... and in what point of the timeline i am.'
Lucas knows that if he was lucky to arrive in the right moment, he would potentially be able to get the Kamaboko Squad... tho he really doesn't want to kill Nezuko so he might need a way to make her not hate him if he turns her brother.
Maybe the fact he is also planning to kill the man who killed their family would help, after all Muzan is one of his main targets, he will turn Michael Jackson's evil Japanese twin into his greatest meal.
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To Be Continued...