It was a nail about 20 centimeters long. From the outside it looked like some
ordinary nail. However, the tip of the nail housed the blood of a Saint.

It was common knowledge that the blood of Saints was poison for the Kyoma. But
other than the Saint of Fresh Blood there was no one who had used it as a
weapon up till now. That was because in order to kill an upper level Kyoma like
Tgurneu, one would require to use about a cup of blood. Atro had succeeded in
extracting the poison from the Saint’s blood and crystalizing it. And the tip of the
nail was made from that poison crystal.

If a Kyoma were stabbed with that nail, the poison would instantaneously run
through their body. Curing it with some kind of antidote nor extracting it from the
body with some ability were completely impossible.

Atro had named it the Nail of the Saints and had called it his greatest
masterpiece.