Demon Slayer: Why Can't Demons Say Muzan's Name?
Kibutsuji Muzan, Demon Slayer's King of Demons, has few weaknesses, but he still must hide from the sun. For the centuries he has been alive, Muzan's goal is to concur death and live eternally. Muzan has gained powers during this long journey: the demon curse or Muzan's curse.
A demon can only get this curse by ingesting Muzan's blood. It seems easy to avoid, but power is both intoxicating and frightening for demons. Many follow Muzan because he has great power; they don't want to risk their lives, so they follow his command. So, what is this curse that some of Demon Slayer's strongest demons are willingly taking on?
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This curse besotted any who partake of Muzan's blood must be careful. The curse prevents Muzan's name from being spoken aloud, and any who do will meet a horrible demise. One demon, Susamaru, faced this reality when battling Tamayo. Susamaru accidentally shot Muzan's name aloud, attempting to defend his honor with her mind clouded. Even though Susamaru was defending Muzan, the curse still took effect, causing three demon arms to burst from her chest. Leaving Susamaru a puddle of blood and guts, waiting for the sun to kill her finally.
Based on what happened to Susamaru, it's clear that the curse has no mercy; no matter the reason or context, it will destroy the demon that says Muzan's name. Knowing this if a demon slayer was clever enough, they could get a demon under Muzan to say his name, forcing them to face the curse. Then again, Muzan might trigger the curse himself, preventing the demon from being manipulated by another. This exact scenario happens (in the manga) when Yushiro is controlling Nakime. To stop Nakime from moving the Mansion, Muzan activates
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