Chinatsu learned from Shinobu Kocho that the "Ultimate Poison" was complete. It was one of their greatest assets against Muzan. Without it, they could never take the initiative and enter the Infinity Castle dungeon... they would be wiped out!
Tamayo and Shinobu Kocho had developed this Ultimate Poison together. Although they called it a single poison, it was actually a perfect blend of four drugs with different effects.
The first layer: the Human Transformation Drug.
This was the Ultimate Poison's outermost layer. Once injected into Muzan, it would gradually turn the demonic factors within his body into human ones. If Muzan did nothing to resist it, he would turn from the Demon King into a human.
Of course, Muzan would never surrender so easily. Once injected with the poison, he would certainly work to break it down inside his body. But by the time he stripped away that outermost layer, the other three effects hidden beneath it would already have penetrated deep into his body.
The second layer: the Accelerated Aging Drug!
The third layer: the Self-Destruction Inhibiting Drug!
The fourth layer: the Cell-Destroying Drug!
Under the effects of this poison, a blend of four drugs, Muzan's strength would drop from the pinnacle of the Demon Slayer world, second only to Yoriichi, to... still the pinnacle, second only to Yoriichi.
But at least he would no longer be quite so far beyond their reach.
"I only handled a few steps in making this poison. Tamayo completed the final step, and she has the finished product right now..."
By the time Shinobu Kocho finished speaking, Chinatsu had not only recovered her energy and spirits completely but had also quickly decided what she needed to do next.
"I'm going to see Tamayo right now. Please ask for leave from training for me~"