During that night's patrol, one unlucky demon had the misfortune of being discovered by Kanzaki Kumo.
Then it became a demonstration of the phrase "hacked to pieces."
Ink Shadow trembled as he watched from the sidelines.
Ink Shadow: Was anyone going to do something about this? Someone was terrorizing a little animal here!
Although he was venting a little, Kanzaki Kumo did not, after all, have any abnormal preferences like torturing things to death.
He had only done this to rob the demon of its ability to resist.
His purpose was to test a drug.
Yes, the new poison Shinobu Kocho had developed, to see what sort of effect it would have on demons.
There was no helping it. Since Kanzaki Kumo knew Muzan could see other demons' memories, he could never agree to have anyone capture demons and bring them near the Butterfly Mansion for drug testing. As for methods like drawing blood or taking living tissue samples, those things would also disintegrate once the demon was killed.
(P.S. In this book, the blood-drawing instrument Tamayo gave Tanjiro was something she specially made to preserve demon blood.)
With its current manpower, the Demon Slayer Corps could not build a prison elsewhere to hold demons, either.
Most members of the Demon Slayer Corps merely applied the drugs to their blades, and their feedback on things like the actual dosage that reached the demons and the effects afterward was extremely vague. Many had not even paid attention to the drugs' specific effects, only saying that they did indeed make killing demons easier.
That was all.
Experimental feedback like this, which was barely better than nothing, offered very limited help to the Butterfly father and daughter in developing their drugs.
Besides, wounding demons without killing them was an impossible strategy for ordinary