Webmuzan kibutsuji's motivation to kill tanjiro's family was to create a demon immune to sunlight, fulfilling his desire to be unstoppable. Nezuko's transformation into a. Webback when muzan was a mortal man, he suffered from an incurable disease set to kill him before he reached the age of 20. Desperate, muzan allowed his doctor to. Websoon after killing the mysterious man, muzan discovered that the medicine that the man had given him actually worked. Not only that, it actually gave him incredible. Webthe official fanbook of demon slayer explains muzan’s human forms, stating that he kills wealthy individuals, so he can take their appearances to accumulate. Webcontrary to initial belief, muzan kibutsuji's heart stopped several times while he was still in his mother's womb, resulting in a persistent struggle for survival during the. Webseeking a cure, muzan continually experiments on humans to turn them into demons. However, he remains frustrated by the limitations of his condition. Webwhen muzan appeared during the final battle in the hashira training arc, tanjiro was the only one who recognized him immediately. His instantaneous reaction to. Webmuzan's transformation into a demon was actually a complete accident. In the early 900s, 1,000 years before the story, the human muzan was dying of an. Webever since he was a baby in the heian era, muzan kibutsuji was always stricken with illness and thanatophobia, or fear of death. According to the demon slayer.
