The Soul-Eating pill is a 4th class middle class pill, which allows the user to consume another mans power. As you can see on the page on the right, he explains all of this. But I really don´t get what he means by "swallowing", logically I would think that the one who swallows the pill has his Qi and Blood crystalized inside his body, which means you would need to cut it out. But after some discussing with friends and admins, we have come to agree, that the pill works like this.
The one who swallows the pill dies and his qi and blood is crystallized and turned into a pill outside the body, which in turn someone swallows to gain the deceased's power and qi. It is unknown if the Soul-Eater pill takes blood transfusion into account. Most likely not but hey who knows. Anyway, this is the explanation that we have reached.