Then I suggest you review your high school biology books if you think there's nothing strange about how this phagogenesis works. It's even stranger than Lamarck's theory of inheritance of acquired characteristics. Yet you need to do nothing but add nen to the equation, and you have a perfectly working system. I can't fathom why you wouldn't even consider it.

That was my whole point. I see nothing wrong with beasts using magical abilities (such as nen), but I can't see them using ritualistic magic. After all, folklore and fantasy are packed full of magical beasts.