Demon Slayer Corps

The Demon Slayer Corps is an organization that has existed since ancient times, dedicating its existence to protecting humanity from Demons.

There are hundreds of Demon Slayers within the organization, but they aren't officially recognized by the government.

Joining
In order to become a Demon Slayer, an individual must pass the Final Selection, a test used as an entrance exam to join the Demon Slayer Corps. During this selection, examinees must survive for seven days on a mountain top infested with Demons without any aid from the outside world.

Candidates who complete the Final Selection are issued the standard uniform, as well as being given the opportunity to choose the ore for their special sword, which is designed to eliminate demons efficiently. Each new Slayer is also assigned a Kasugai crow for communication purposes.

Ranks
The Demon Slayer Corps has ten ranks. From lowest rank to highest, these ranks are: Mizunoto→Mizunoe→Kanoto→Kanoe→Tsuchinoto→Tsuchinoe→Hinoto→Hinoe→Kinoto→Kinoe Once a Demon Slayer has fully settled into the organization, they are granted the lowest rank: Mizunoto. They must complete a variety of missions to ultimately reach the highest Demon Slayer rank: Kinoe.

Pillars
Within the Demon Slayer Corps, there is a group of elites, known as The Nine Pillars. This group consists of the nine most powerful combatants in the organization.

In order to become eligible to join the Pillars, a Demon Slayer must either successfully kill 50 Demons or kill a member of the Twelve Demon Moons, a group of the most powerful demons in existence who serve directly under the Demon King, Muzan Kibutsuji.

Tsuguko
A Tsuguko is a very talented Demon Slayer that has been designated as the successer to one of the Nine Pillars, should that Pillar retire or die. In order to become a Tsuguko, a Demon Slayer can either apply and get accepted, or get scouted by one of the current Pillars.

List of Members
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Physical Abilities
All of the Pillars and some of the lower-ranked slayers have enhanced strength, speed, stamina, agility, mobility of the joints, and resistance to injury; all at superhuman levels.

Abilities specific to certain individuals include unconscious combat, omnipresent rage, unique muscle composition, enhanced senses, and extrasensory perception.

Senses
Some slayers have naturally enhanced senses, which they use in combination with existing breath styles or develop new breath styles (like the Sound Breathing Style).

* his ability is referenced as echolocation

Extrasensory perception (ESP)

 * Ability to See-Through (Tanjiro Kamado)
 * Ability to See-Through (Yoriichi Tsugikuni)
 * Ability to See-Through (Gyomei Himejima)
 * Ability to See-Through (Michikatsu Tsugikuni)
 * Ability to See-Through (Muichiro Tokito)

Breath Styles
Breath styles are swordsmanship styles practiced and taught by the Demon Slayer Corps. The Breath Styles make use of specific and concentrated breath patterns, which increase the user's lung capacity and amount of oxygen in the blood. This increases the users physical abilities and mental concentration, allowing them to fight on par with Demon's, whose physical prowess surpass that of the average human.

Focused breaths are also capable of clotting wounds from severe injuries and slowing down the circulation of poison in the bloodstream.

All Breath Styles currently taught within the Demon Slayer Corps are derived from the the Breath of the Sun, the first one ever created.

Full Focus Breathing
Full Focus Breathing, also known as Total Concentration in some translations, is a state where Breath Style users inhale the maximum amount of oxygen within a specific breath pattern to raise their physical and mental strength to their utmost limits. It is often used by Demon Slayers to temporarily prepare a decisive attack.

Advanced Demon Slayers, such as Pillars, can constantly maintain a Full Focus Breath state, even while asleep. There is an immense difference in strength between someone who can maintain Full Focus Breathing at all times and someone who cannot.

Demon Slayer Marks
A select few in the Demon Slayer Corps have recently developed a mysterious marking that can be unlocked and may appear on the body of a strong Demon Slayer. It resembles the Demon Crests that Demons posses. These marks are referred to as Demon Slayer Marks. It looks somewhat like a tattoo, scar, or birthmark and each Demon Slayer Mark looks unique, relating to the Breath Style of the bearer.

The first recorded occurrence of these markings were in the Sengoku Era, possessed by the first person with a Demon Slayer Mark was none other than the first Breath Style user, Yoriichi Tsugikuni and a handful of swordsmen who practiced the Breath of the Sun technique. It is said that the Demon Slayer Mark has resonated since then and has been awakened by other Demon Slayers, which would later lay the foundation for the "Golden Era" Demon Slayer Corps that almost succeeded in killing Muzan Kibutsuji.

Demon Slayer Marks disappeared for a long time, due to the countless times the Demon Slayer Corps was nearly annihilated, until it reappeared on Tanjiro Kamado, and subsequently, the other Pillars that resonated with his mark.

Each Demon Slayer Mark has a unique appearance that is related to the user's Breath Style. For unknown reasons, Yoriichi Tsugikuni was born with a Demon Slayer Mark.

Unlocking
The Demon Slayer Mark can only appear in Demon Slayers that survived the life-threatening conditions of having a heart rate over 200 bpm and a body temperature over 39° Celsius. The precondition in unlocking it is that an individual directly related to the Breath of the Sun has been born with it.

The Demon Slayer's mark also has the ability to act as a catalyst, and spread from the original user to other strong Slayers, such as the Pillars, through resonance, granting them Demon Slayer Marks of their own.

Abilities
The Demon Slayer Mark grants the user a number of abilities that are very advantageous in battle, especially against Demons.


 * Enhanced Physical Capabilities: Upon activating the Mark, the user is granted superhuman strength, speed, and enhanced breathing techniques beyond that of a normal Breath Style user. Their strength and speed could even rival that of the strongest Demons, like the Upper Moons of the Twelve Demon Moons.


 * See-Through World: The user becomes able to see the muscles, blood flow, and joint movement of living beings, allowing the user to accurately predict and react to their movements, as well as confirm their well-being. Additionally, the user gains hyper-perception, allowing them to perceive the world around them at a much fast rate, making it appear to them as if the world was going in slow motion.


 * Crimson Red Nichirin Blade: Demon Slayer Marks may enable the users to dye their Nichirin Blade in a crimson red color, giving their blades the ability to hamper the enhanced regeneration of demons.

Curse of the Mark
Having the Demon Slayer Mark has its costs. Demon Slayers who have awakened the Demon Slayer Mark are said to die upon reaching the age of 25, which Kokushibo speculated to be because the mark exchanged the life span of its user for power.

There are ways to avoid dying through the curse, as shown by Yoriichi and Kokushibo. Through unknown means, Yoriichi was able to defy fate and lived to be 85 years old, while Kokushibo choose to become immortal by becoming a Demon.

Notably, all records of users of the Mark dying at the age of 25 are of much older era than present times, which means this could merely be a superstition, as many Demon Slayers die at a young age because of their dangerous line of work.

Uniform
The members of the Demon Slayer Corps wear a uniform that is highly durable and light-weight. The uniform cannot be easily damaged by minor Demons.

The Demon Slayer uniform appears remarkably similar to a Gakuran uniform.

Nichirin Blade
The Nichirin Blade is the signature weapon of the Demon Slayer Corps. It is a katana sword made from a special ore that constantly absorbs sunlight.

The blade changes color upon the wielder drawing the blade for the first time. The color that the blade changes is dependent on the user and the different colors bestow different properties on the blade.

History
It is implied by Kagaya Ubuyashiki that Muzan Kibutsuji came from the same family as him about 1000 years ago. Kagaya states: "This led to the family bloodline being cursed. Every child born in our family was weak, and they died right away. But when our family was about to get wiped from existence, the priest gave us some advice. A demon came from our bloodline. So you must dedicate your soul to defeating him. And if you do that, your family will not die out. We have received wives from our priests for generations. And our children are more resilient to death now. But nobody in our family has lived beyond thirty." This indicates that the Ubuyashiki family has led the battle against Muzan for almost 1000 years.

Trivia

 * Rank symbols can be shown at the back of each Slayer’s hand. In the Pillars’ case it’s their title what becomes visible.

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