User blog comment:Wrath022/Chapter 516: The Truth About Enchantment, Review/@comment-4507125-20161231163540/@comment-14772371-20170101081301

Actually, it appears demonification works in the exact same way. Neo-Minerva was created by infusing her with dragon particles. Mirajane was unaffected because she already had them. Moreover, she could control them giving her the ability to destroy all regeneration chambers remotely. And I've been wondering how Gray got his demon-like abilities. Thinking about it, he must have literally been bathing in Silver's blood since he shot a hole in him. That's not something that's very children-friendly to show though. ;) Instead a "memory" was passed on, and instead of leaving a dead body, Silver vaporized and went up to heaven - the children-friendly way of dying.

That leaves the question what a "dragon seed" or "demon seed" actually is. Is it some fixed physical thing (that could conceivably be removed), or just an initial dose of dragon particles respectively demon particles? What does it even mean that a dragon "teaches" dragon slaying? It seems to me that some kind of blood transfusion may be involved.