Muzan extends a surprising amount of control over those who he has transformed, able to kill them with ease simply for things like speaking his name. In chapter 127 of the Demon Slayer manga ...

She goes by the name of ... how hard a Demon Slayer trains, they'll be tossed to the side without a bat of the eye. Muzan's sole focus is finding the Blue Spider Lily, a mystical flower known ...

The main antagonists in Demon Slayer are Demons ... Nichirin Swords that have the property to absorb sunlight. Wisteria flowers are also believed to be poisonous to them. The only way to kill ...

smaller areas on the mountain is Wisteria Flower Forest, a beautiful lavender location filled with wards to keep demons at bay. The Mugen Train sets the scene for Demon Slayer's first eponymous movie.

It makes sense to read One-Winged Butterfly and The Flower of Happiness together as they cover roughly the same time period. That is everything you need to know about all Demon Slayer Arcs in order.