Tanjiro doesnt know this because the 11th style is an original attack created by Giyu Tomioka but somewhere in the episode they said that every user can be able to have its own unique extra form.
The Thirteenth Form of the Sun Breathing Style is unique in the sense that it doesn't really have a name of its own. Rather, it's a combination of all the twelve forms present in this style, used in succession to maximize their power. This move was devised by Tanjiro solely to defeat Muzan.
12 Water Breathing: Seventh Form – Drop Ripple Thrust
In order to counter these fast-moving balls, Tanjiro's first move was to use the Drop Ripple Thrust. This form involves a swift stab at a target and was used to reduce the impact of an oncoming temari. It is also known to be Tanjiro's fastest thrusting technique.
Demon Slayer's season 3's latest episode has left fans on edge with Tanjiro's discovery of Yoriichi Tsugikuni's Type Zero sword.
The warrior Muzan feared was a swordsman named Yoriichi Tsugikuni. Yoriichi was the only slayer before Tanjiro who came close to killing Muzan, and the flashback of their fight occurred in Chapter 187.
Post-Transformation
Sensing their despair, Doma offered a chance to him and turned both Gyutaro and Daki into demons.
It was created by Kannari Raigō, one of Yoriichi Tsugikuni's students who attempted to learn the Sun Breathing, but due to him not being as innately powerful as Yoriichi, he was instead taught an alternated breathing style that focused on his individual strengths and weaknesses, which eventually evolved into the ...
Yet an official Demon Slayer "fanbook," written by the manga's creator, Koyoharu Gotouge, revealed Muzan doesn't really like Upper Rank Two demon, Doma. As Lower Ranks Six, Four, Three and Two can attest, Muzan is not averse to eliminating demons he doesn't care for, even if they're Kizuki.
Anne was originally planned to be Muzan`s older sister, who died by the hand of a Demon Slayer but that idea was scrapped, as the author knew practically nothing about Muzan`s early life. Instead, Anne became his wife, by which he had two children.
Some of the characters who have faced Yoriichi and survived
This happened due to a treatment that had gone wrong. While he was being treated, Muzan killed the doctor because he was not able to observe any results.
During episode three, we learned that the Yoriichi Type Zero was built by Kontetsu's ancestors more than 300 years ago during the Sengoku era.
This is the sword that appeared out of the neck of the doll at the end of Demon Slayer season three's second episode. In the manga Tanjiro has the sword repaired by Haganezuka, who he initially traveled to the Swordsmith Village to find.
During the Sengoku period, members of the Swordsmith Village created a specialized battle doll to train Demon Slayers. It was modelled after Yoriichi, the progenitor of Breathing Styles and the strongest Demon Slayer to have lived.
Yoriichi Tsugikuni is the creator of the Sun Breathing style and is also the strongest demon slayer that has ever lived. He existed nearly 500 years prior to the events of Demon Slayer and struck fear into the hearts of every demon he came across.
Breath of the Sun
It's the oldest and most powerful breathing style that was used to develop the Flame, Water, Moon, Thunder, Stone, and Wind Breathing techniques that demon slayers use to this day. It mimics the intensity and versatility of the sun, lessening a demon's ability to regenerate.
Hinokami Kagura (Sun Breathing)
The Hinokami Kagura is a Breathing Style that is passed on from father to son in every generation alongside the Hanafuda earrings.
Initially, Tanjiro's accuracy and strength were not up to the mark, which is why Muzan was able to avoid his attacks. However, Tanjiro accurately performed the thirteenth form and inflicted a ton of damage on the Demon King.
1 Seventh Form: Honoikazuchi No Kami
This mastery allowed Zenitsu to form a Seventh Form of Thunder Breathing that is unique only to him: Honoikazuchi no Kami. While this move might seem similar to Thunder Breathing's First Form, the speed and power of this technique are on a whole new level.
Nezuko's unusual ability can burn her blood and turn it into an explosive flame with her pyrokinesis ability. This is why Tanjiro's sword turned red due to her pink explosive flame that can rend through demons quite easily.
Despite being a blood-thristy demon who has murdered several people, he has a set of principles he adheres to. One thing that Demon Slayer fans have noticed is that Akaza refuses to eat or kill women. Additionally, the Demon King, Muzan, gave Akaza special permission to do so.