Capítulo 168: Last choice

 "The only thing we can do is continue to strengthen Mr. Haruhi's magical core by channeling magical energy into his body," explained one of the doctors there.

The common poison that is effective for poisoning animals and humans will not work in the body of non-human beings. But unlike poison that is powerful enough to poison non-magical creatures, such poison can poison humans with very lethal effects.

 "Okay, now we do what we can to strengthen Katsuki's condition, which is very weak right now. But you must find an antidote for this poison as soon as possible," Shouki asked seriously.

 After hours of struggling with Katsuki's health condition, which has not improved until now, the medical personnel there have also reached their limits.