Board Thread:General Discussion/@comment-6192846-20130913170916/@comment-6192846-20140611233256

Now that I think about it, the jis tiama is supposed to counteract the key's poisonous properties right? Maybe that's the reason.

Actually, the emphasis put on a "vaccine" is interesting (especially since it was written in katakana, aka in Engrish).

If that's the case, and the Demon of Gluttony's magic was passed down to the child, wouldn't the same be said for whatever magic Carlos had?

Vaccines are typically based on a weaker or killed off version of the disease they're taken from, allowing the body to build up the antibodies to counteract the disease immediately and prevent future infections almost as soon as they get into the system.

So if the poison of the Golden Key is what's "ailing" Banica (ie, the Demon), perhaps this magic in a weakened state (or lesser amount) being passed on along with Gluttony magic from Banica into the child is what made it effectively a "vaccine"?