Demon Slayer Corps

The Demon Slaying Corps is an organization that has existed since ancient times, dedicated 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 Slaying 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 pass the Final Selection are automatically granted the rank of Mizunoto, and must complete a variety of missions to ultimately reach the rank of Kinoe. In addition to ranks, a Demon Slayer who has killed either 50 demons or one of the Twelve Demon Moons may also become a Pillar. Ranks are as follows: Mizunoto→Mizunoe→Kinoto→Kanoe→Tsuchinoto→Tsuchinoe→Hinoto→Hinoe→Kinoto→Kinoe 

Upon completing the Final Selection, Demon Slayers are issued the standard uniform, which is highly durable and light-weight and cannot be easily damaged by minor Demons. They are also given the opportunity to choose the ore for their Nichirin Blade, which is designed to eliminate demons efficiently. Slayers are each assigned a Kasugai crow for communication purposes.

History
It is implied by Kagaya Ubuyashiki that Muzan Kibutsuji came from the same family as his 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.

Breath Styles
The style of breathing techniques taught to most Demon Slayers in order for them to efficiently perform missions. These techniques are used by most Demon Slayers, especially the higher-ranking ones.

Physical Abilities and Attributes
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 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)

Demon Slayer Marks
A select few in the Demon Slayer Corps have recently developed special marks on their skin similar in design to various Demon Crests. These marks are referred to as Demon Slayer Marks. The first recorded occurrence of these markings were in the Sengoku Era possessed by a handful of swordsmen who practiced Sun Breathing. It's told to us by Amane Ubayashiki that these samurai swordsmen were once inches away from ending Muzan.

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