Did Tanjiro learn the 13th form?
This form is a repetition of every Sun Breathing form performed in succession that would kill Muzan by hurting all of his vital organs. In Chapter 192 of the manga series, Tanjiro realized that this s what the thirteenth form was. Does Tanjiro use the 13th form of sun breathing? Tanjiro commences the Sun Breathing: Thirteenth Form against Muzan. How many forms of Sun breathing does Tanjiro know? In the memories, Tanjiro observes Yoriichi performing 12 of the Sun Breathing formations, which help him perfect his usage of the technique.