(credit to @xyzdragon1234) 

Name: Rayna Ferrer

Age: 18

Alias: Euna

Hair Color: Jade Green

Eye Color: Black (Glows Green)

Gender: Female

Appearance: Same big bust as her sisters, and Poison Markings on her skin.

Personality: She's a glutton, though she has manners when she eats she loves to eat. She is nice and kind and loves to give random acts of kindness to others. She's also the smartest of the four second only to Ronin. While she does represent the horsemen of famine she does share her food with only two people the ones who need it and her siblings when it comes to strangers she doesn't even budge an inch and is very stingy when they ask her for a bite their are even times where she acts like a beast when she doesn't want to share her food. She does get along greatly with Adrian the Sin of Gluttony since their Signs are similar and Adrian sees her as a big sister because she reminds him of her sister and is the only one who can scare the Wendigo away. Just like her siblings, she shares the same cold personality switch.

Guild Emblem Color: Green

Outfit: Black Turtleneck sweater, blue knee-length skirt, black stockings, and wearing black combat boots with belt buckles on them.

Horsemen: Famine

Magic: Venom Demon Slayer Magic, Viral Magic (Basically think of Prototype), Acid Magic, and Prison Dragon Magic.

Prison Dragon Magic Skills:

Absorption Line: also known as the Black Dragon's Pulse, is one of the magical skills Rayna can use. When she activates it, it resembles a small lizard (more specifically, a chameleon) with a deformed face that appears on the user's hand. Rayna is also able to form an Absorption Line on both her arms and legs. It has the ability to make lines of connections that allow the user to either absorb or transfer power from opponents, allies, and objects.

Blaze Black Flare: also known as the Evil Dragon's Black Flame, is one of Vritra's Magical abilities that grants Rayna the ability to unleash Vritra's deadly cursed black flames to burn her opponents. The flames themselves are able to curse the soul of any being caught and killed by them for eternity, with the user being the only exception as it grants immunity over them since they can be used to cover the user for protection. The curse properties of these flames are nearly enough to counter other flames and eat them including eating away and burning spells and magics especially light magic and holy magic.

Delete Field: also known as the Domain of Darkness, is one of Vritra's Magical abilities. It has the ability to suppress the opponent's powers. Rayna has also shown to use this skill on herself making her able to suppress the powers of her enemies by just touching them.

Shadow Prison: also known as the Prison of the Dragon, is one of Vritra's magical abilities that allows Rayna to use Vritra's black flames to restrain her opponents. However, because of Rayna's and Vritra's bond, this magical skill evolved. This change made the user able to manipulate the shadows around her in many ways possible, even turning herself into a living shadow.

Venom Demon Slayer Spells: 

1. Venom Demon Rage: The user inhales and gathers all the magic energy they can into their mouth. After inhaling, the user releases their energy in a large blast of poisonous gas and acidic, green-colored liquid towards their target. If the target inhales the gas or touches the liquid with their skin, they can become ill or burned from the acid. The attack also delivers a large amount of blunt force, concentrated towards the target, sending them flying.

2. Venom Demon Venomous Fist: The user's hand is engulfed in a dark green liquid. When the user punches the target, the liquid seeps through the skin of the target and is absorbed into the bloodstream. This causes the target to become sick and begin hallucinating.

3. Venom Demon Green Pentagram: The user places their hands together sideways. They slowly separate them and a circle of green liquid forms between them. The liquid flows into the shape of a pentagram and slowly grows bigger. The Pentagram shape spirals towards the target and when contact is made the liquid burns the enemy's body and poisons them.

4. Venom Demon Hell's Veil: The user's body is engulfed by a dark green ooze starting at the arm of which the user's devil tattoo is located. When the user's body is fully engulfed, all magic attacks are negated and all physical strikes tend to hurt the target more than the user.

5. Venom Demon Triple Entente Damnation: The user envelopes their fist in an acidic light green ooze first. They punch their target in the gut to start with, knocking them back slightly. The acid burns through any light armor or clothing on the target's body. The user then makes a claw out of a very basic ooze which is a darker shade of green. The user makes a swiping motion with the claw, slicing into and burning the target's flesh. Finally, the claw becomes a long, sharp spear-like spike, which becomes crimson and very infectious. The user thrusts the spike into the target, infecting its bloodstream with a deadly toxin.

6. Venom Demon Ribbon: One of Rayna's signature spells, which she takes full advantage of the Venom Demon Slayer's physiological changes. Quite simply, this spell is activated by exerting large volumes of green poison from her body, which is then accumulated at a focal point, before spreading out in numerous directions from that point. This, in turn, causes it to appear akin to a ribbon, hence the namesake of the technique. She uses her magical influence to direct the said ribbon, allowing it to become a potent defense by surrounding him, or a potent offense and binding tactic as well.

7. Venom Demon Snake Charmer: One of her more unique spells, and possibly the most direct spell of any Demon Slayer style in existence. It is initially known to the wielder of the magic because it is a side-effect of learning the magic, in order to resist any manner of poison used against her. The snake charmer is a spell that Rayna uses when concentrating magic on her fingertips and making physical contact with her enemies. This, in turn, causes her magic to seep into the body of whoever she made contact with, at which the magic increases by devouring the magic of the opponent. Reaching the veins of an enemy, the poison from the magic proceeds to envelop their entire body in black markings, which causes paralysis and immense pain toward the enemy. Furthermore, increasing the concentration of this poison can provide Rayna with the ability to kill an enemy effortlessly, making it a highly difficult spell to avoid. The only known way to evade the spell is by expelling a tremendous quantity of magical power outward, removing the influence of Rayna's magic upon them. However, this in turn causes physical and magical exhaustion, which is another advantage for Rayna.

8. Venom Demon Shesha: A spell thought to be extremely occult in its workings, and something which Rayna only employs as a last-ditch effort to kill her enemies. As stated before, the Venom Demon's Snake Charmer spell is present within the body of the user of Venom Demon Slayer Magic, internalized within their physiology in order to allow them resistance to all poisons and the ability to digest them all within their body. Taking this concept to the next level, Rayna devised a method to employ the additional magic that is stored within her body in order to create a highly effective means of enhancing her abilities. By releasing the Snake Charmer spell upon her own body, before completely internalizing it with her own magical reserves, the Shesha spell enhances Rayna's attributes to a phenomenal level. In exchange, she gains a serpentine appearance to accommodate these changes. These include snake-like eyes, with markings that appear like eye make-up, along with serpentine ear-like protrusions, scale-like markings across her body, and even a tail made out of a snake. These are quite useful in physical combat, according to Rayna, but she tends to use the spell for a full-scale assault prior to its dispelling, which can be done by expending enough power.

9. Venom Demon Noxious Aura: The caster releases a weak gaseous poison into the air surrounding them, the poison reduces in effectivity the longer it is exposed to oxygen, therefore, it is merely an aura surrounding the caster in case of assassinations or to repel close-range combatants.

10. Poisonous Mist Death Trap: one of the trump cards, which Rayna has. Similar to the Roar Spell, Death Trap is a gas-like poison, that revolves around Rayna in large amounts. While Rayna can freely control this spell, the mist itself has a high density and doesn't allow us to see something in it. With it, the mist is also quite toxic, while the person, which caught up by this spell has only two choices - first is to not breathe to save their life, and second is to breathe, but poison their body. Also, the poison, which mist consists in itself is very dangerous to the breathing system of the human body. As a result, the longer a person breathes the poisonous mist, the more frightened are the consequences.

11. Poisonous Mist Shirek of Winged Venom: A more powerful version of the Rage, this can be influenced greatly by the user's concentration allowing them to concentrate the shockwave into an extremely powerful thin beam, or into a large wide area attack.

12. Poisonous Mist Atomic Burst: She Absorbs all Ethernano in the area and releases it into a giant venomous pulse explosion. This explosion is just as powerful as a nuclear bomb and it's capable of wiping entire nations off the map. 

Demon Modes: 

Demon Force: Demon Force is the final stage of the Demon Slayer Magic, the embodiment of the ultimate power that Demon Slayers may possess, though the exact conditions to invoke it vary from person to person. When entering the said form, the user's body fully transforms into the element the Demon Slayer has in their possession, by saturating the insides of their body and the outsides with an overdose of Magical Barrier Particles. Such form change grants them the enhancement of their physical traits, like strength and speed, and demonic abilities they have, improving their combat capability significantly. Demon Force greatly increases the damage done by standard Demon Slayer Magic attacks and grants the user access to more advanced, powerful attacks. It also drastically enhances the user's physical prowess, making them far stronger, more resistant, and faster, and boosts their demonic power, prompting it to violently become visible, taking on the shape of a demonic visage; When used at the fullest, the generated silhouette seems to gain corporeality, likely as a result of the immense amount of demonic power employed. As the Demon Slayer's entire body turns into their element, after activating Demon Force they are virtually immune to physical harm. They can allow any attack to simply pass through them or simply absorb the attack; it is essentially a boost in the demonic properties that Demon Slayer Magic provides to the user.

Overdrive: Similar to Edens Zero By allowing the user's Ether power to flow throughout their entire body, the user can acquire a massive boost to their capabilities as well as being able to achieve feats with their magic they normally wouldn't have been able to. Along with this increase in power, the user also takes on a new appearance similar to that of the machine; having three-dimensional lines surrounding their body and covering their skin.

Demon Force Overdrive: Combining the power of Demon Force and Overdrive the user is granted an even more powerful boost in their magic power that it even starts affecting the Ethernano around them.

Radiation Demon Mode: In this mode, the venom becomes just as deadly as the radiation, and just by breathing it, it can mess with the user's magic either mutating it or making go out of control.

Venom Demon Queen Mode: In this mode, her venom turns dark purple and it becomes too deadly it's capable of destroying anything it touches and killing all who are caught in it. It can even transform the people who were killed by Rayna into a wave of death coming to completely devour them. She calls this venom the "Venom of Famine" cause all those who were killed by her and became part of her wave of destruction yearn to hunger for the person they're coming for.

Backstory: Once upon a time, in the vast and powerful Xilian Empire, a secret project called "Project RRRR" was initiated. The empire's ultimate goal was to conquer the northern continent of Frostland, followed by Ishgar, and finally, their mortal enemy, the Alvarez Empire. However, they faced a significant challenge - they had discovered four lacrimas containing the forbidden and immensely powerful Lost Magic known as Demon Slayer Magic, but they lacked suitable vessels to wield this extraordinary power.

Years ago, the Xilian Empire stumbled upon these lacrimas and sought to harness their potential as weapons. However, anyone who attempted to use this magic either perished due to its overwhelming strength or succumbed to arrogance and met a similar fate. It became clear that conquering other continents without proper vessels for the demon slayer magic would be impossible. Thus, the empire devised a plan to create four children who would become these vessels, capable of killing without hesitation and devoid of any emotion. And so, the Ferrer siblings were born.

However, unbeknownst to the higher-ups in the empire, the head of the project, Dr. Renee Ferrer, and a group of loyal scientists treated the siblings not as weapons, but as normal children. They provided them with toys, taught them to read and write, and even gave them names - Ronin, Rin, Rio, and Rayna - adopting Dr. Renee's own surname out of affection and admiration.

This act of humanity did not sit well with the higher-ups, who believed that the scientists were treating the siblings poorly and foolishly. As a warning, they began executing the scientists, making it clear that the children were to be treated solely as weapons. However, the Ferrer siblings were still children at heart, unable to bear the thought of living their entire lives as mere tools of destruction. They yearned for freedom and a chance to live as ordinary individuals.

In a daring move, the scientists hatched a plan to break the siblings out of the corrupted empire and escape its clutches. News of this plan reached the Emperor of Xilian, who was outraged by the betrayal. He ordered his soldiers to find and capture the siblings, executing the traitorous scientists and bringing Dr. Renee Ferrer's head as proof of their loyalty.

Just as they were about to be cornered by their pursuers, fate intervened. The siblings stumbled upon ancient ruins that housed a spell of unimaginable power - a spell capable of bringing about the destruction and death desired by their enemies. This spell, known as the "World of Nothingness," offered a glimmer of hope and a chance for the siblings to turn the tide in their favor.

Without hesitation, the Ferrer siblings delved into the secrets of the spell. They discovered that, in order to cast it, an infinite amount of ethernano was required. Undeterred by this seemingly insurmountable obstacle, the siblings pooled their magical powers and combined them to cast the spell. Miraculously, they succeeded.

The entire Xilian Empire, once a symbol of power and dominance, was wiped off the map, reduced to nothingness. The siblings had achieved their freedom, but their hearts were heavy with the loss of their mother and the sacrifices made by those who had aided them in their journey.

Before embarking on their quest to explore the world they had long been denied, the Ferrer siblings paid tribute to their fallen mother. In the very place where they had discovered the spell, they erected a monumental grave, a testament to Dr. Renee Ferrer's love and sacrifice. They bid their final farewells to all those who had helped them gain their freedom and set forth into the unknown.

Their travels took them far and wide, introducing them to a myriad of people and experiences. Each sibling honed their magical abilities, learning new spells and techniques. Ronin, the eldest, encountered Ashborn the Shadow Monarch, and he became his mentor, passing down his magic and knowledge to his successor. Rin, ever curious, stumbled upon weapons belonging to legendary heroes and gods, even mastering the ancient art of Unlimited Blade Works. Rio delved into the mysteries of Word Soul Magic and Curse Warding Magic, while Rayna embraced the powers of Viral and Acid Magic, and forming a unique bond with the enigmatic Vritra.

For nine years, the Ferrer siblings traversed the world, leaving their mark wherever they went. It was during their journey that they chanced upon the guild known as Devil Hand, where they would encounter a fateful meeting with a person named Y/N. Little did they know that this encounter would shape their destinies in ways they could never have imagined.

And so, the Ferrer siblings, once created as weapons of war, now embarked on a new chapter of their lives, driven by a desire for freedom, justice, and the pursuit of their own individual paths. The world awaited their arrival, ready to be forever changed by their presence.