Demon Slayer Manga Chapter 184

Strength alone was never going to win this night, and Tamayo knew it. Far from the battlefield, the drug she planted inside Muzan works through its hidden stages: aging him thousands of years, blocking his cells from splitting, and slowly strangling the regeneration he trusts completely.

On the field, the effects start to show. Muzan coughs blood, his movements lose a fraction of their speed, and disbelief crosses his face. Demon Slayer Chapter 184 reveals that the war’s most important weapon was loaded into the enemy long before the first sword was drawn tonight.