As the first demon in the world,.

Webmuzan kibutsuji, the series' primary antagonist, killed tanjiro kamado's entire family and turned his sister nezuko into a demon.

Webmuzan's curse killing susamaru.

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Webhe kills with impunity and is the incarnation of evil in the demon slayer world.

Websince the first season, lady tamayo has been hiding from muzan to continue her research about the cure for demons.

Weba brief flashback reveals the only way to defeat muzan is to subject him to sunlight, making this a brutal fight of endurance.

Webthe destroyer of countless innocent lives, all in the pursuit of a selfish dream, kibutsuji is an ultimate evil that lives up to his role.

She moves from one place to another.

Webthe kibutsuji curse happens when one of his minions speaks muzan's name, “kibutsuji,” aloud.

Weba demon called susamaru made the mistake of calling out muzan’s name.

Despite living for a thousand years, or perhaps because of it, muzan is.

She was battling tamayo and she called out muzan’s name in trying to defend his.

If any demon divulges his last name kibutsuji out loud, the curse.

When they do this, three arms will sprout from their bodies and.

Tanjiro’s journey to defeat him wouldn’t be nearly so.

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Muzan places a curse on all demons that have assimilated his blood.