One of the strongest Hashiras in the entireDemon Slayerseries responsible for the all-powerful Stone Breathing technique is Gyomei Himejima, the enigma of the Demon Slayer Corps. Gyomei also mentors Genya Shinazugawa and is well-recognized among his fellow Hashira.
The Stone Breathing technique which he developed is his own version and is one of the strongest breathing techniques in the Demon Slayer series, which incorporates a mix of superhuman hearing and physical strength. Even though Gyomei has been blind since his childhood, his super-senses are able to make up for his disability, allowing him to fight demons with precision.

The Stone Pillar And Humble Giant
The Most Powerful Hashira Is Also The Most Emotional
While Gyomei is one of the strongest Hashiras, he is also the most compassionate Hashira in the Demon Slayer Corps. While he may have an intimidating appearance because of his hulking figure, Gyomei is an emotional giant. He is constantly seen praying or crying over the less fortunate and is rather soft in nature when he is not fighting demons. Another unique attribute is that while themajority of the Hashiras use katanas, Gyomei uses a spiked ball and axe which are connected to each other with a metal chain. This unique fighting style gives him an edge over other Hashiras and also stands a chance against the abilities of powerful demons like Kokushibo, a swordsman who became a demon with nearly five centuries of swordsmanship knowledge.
Gyomei is also the creator of the technique known as Repetitive Action, a technique which maximizes concentration by reminding the user of a painful memory, combined with his awakened Demon Slayer Mark makes him an unstoppable force, and he can keep up fighting high-ranking demons for longer periods of time without faltering. Even though Gyomei has a large build, his speed, reflexes, and strength surpass the average Demon Slayer. Being blind also does not stop him from fighting, as hisheightened extra-sensory abilitiesshow him openings that others do not see.

How Powerful Is His Stone Breathing Technique?
The Stone-Cold Power of This Technique Is Unrivaled
The Stone Breathing technique was initially created by a student of the legendary swordsman Yoriichi Tsugikuni. This technique was derived from Sun Breathing, and due to the inability to completely master Sun Breathing, Stone Breathing was created by focusing on strengths and weaknesses. Stone Breathing also mimics the qualities of stone, which is both solid and grounded. It is also known thattouse Stone Breathing effectively, the user will need to use a heavy weapon such as an axe or kama instead of a katana to unleash the Stone Breathing-based attacks. Stone Breathing also does not derive into any other breathing styles like the others do, which makes it a unique breathing style to acquire and practice.
When it comes to Stone Breathing, there are five known forms that the user can release during battle. Most of these forms require swinging of the axe and spiked ball towards the target. The five forms are known as First Form: Serpentinite Bipolar, Second Form: Upper Smash, Third Form: Stone Skin. Fourth Form: Volcanic Rock, Fifth Form: Arcs of Justice. Each form is stronger than the next, with its impact as deadly as the other.

During the Hashira training arc in the anime, the power and speed of Stone Breathing can be seen as Gyomei unleashes a fury of attacks on Muzan. TheStone Breathing technique is perfect for Gyomeias he is able to combine his raw power and his unwavering resolve along with the powerful weapon he uses to wreak havoc on demons. The heavy strikes with the ability to perform both short and long-based attacks make Gyomei a force to be reckoned with as one of the strongest Hashiras around.