More like crack theory, but it invaded my mind this morning and it just won’t leave me alone, so here goes nothing: going back to the tower of conviction arc, there was a scene that never struck me as odd until, well, this morning and that is:

What that apostle implied about the demon infant dying and dreaming about the “new world” (aka Griffith being reborn and becoming humanity’s savior lmao) hit something in my mind today because the story is currently focusing on bringing Casca’s sanity back, thanks to a journey through her dreams.

And in ch348, it was implied that, even though they’re technically called “dreams”, it’s completely possible through them (and thanks to magic) to change the dreamer who is currently asleep in the “real world”. 

In Casca’s case, hopefully Schierke and Farnese will be able to make good changes, but that got me thinking: what if, through magic, this “corridor of dreams” was… somehow like another “dimension”? A bit like the astral plane if you would, except that it is about “dreams”… 

…and only powerful beings like the Sovereign of the flower storm have access to it. 

Now, look at the moonlight child: he’s a young kid that many readers believe could be what’s left of the demon infant ever since Griffith’s rebirth, but Schierke told us many times that…

his OD, to which the brand doesn’t react to, is strange, which means it has nothing to do with the beings of the astral world (or the underworld) that Schierke is used to and he’s clearly not human (or having to do with Danan). 

We know he’s using the full moon to appear because that’s the time magic forces are at their strongest, and it’s actually been hinted that Griffith doesn’t disappear on full moon nights (meaning that these two probably don’t share a body, at least not during the full moon). We also saw him disappear in vol 37…

…through that tree that expands even to the moon and that apparently links every plane/world together.

Back to the demon infant and dreams, considering his behavior until Griffith’s reincarnation, I wouldn’t be surprised if he were to have dreams about living a happy life with his parents, especially since the Skull Knight confirmed that all children (even demons) yearn for their parents. 

And anyway, one of the reasons many readers associate the moonlight child to the demon infant is basically because the moonlight child, each time he appears, behaves as if he were Casca’s child (eyeing Guts and saving him when necessary too). Isidro even called them and Guts out for looking like a family once. 

Here’s the thing though: we know that the demon infant is definitely a current “living” part of Griffith, as the man commented on feeling the baby’s fear for his parents during vol 22 (when Guts and Zodd were fighting), so if Griffith doesn’t disappear on nights with a full moon…

…that means that the moonlight child (if he’s linked to the demon infant) got his body from someone/somewhere else.

So here’s my theory: what if the moonlight child is none other than the corporeal incarnation of the demon infant’s own dream?

If the baby that became a part of Griffith when he was reincarnated is sometimes dreaming, as the apostle of the tower of conviction implied, then he might be dreaming about seeing his parents again, or simply about what it would be like to spend time as a family?

And thanks to this baby being a strange being in the first place, but also being a part of Griffith and full moons helping, maybe that’s how the moonlight child comes to be every month for just one night (naked as the demon infant always was and powerful, because it’s the full moon or because of Griffith’s powers that the demon infant might be sharing)?

That would definitely explain the boy’s strange OD in any case and maybe even why he looked to have grown up in vol 36/37, as he would be the first dream incarnation that we would meet in the story (and that would fit with the fact that Griffith/Femto definitely seems still corporeal during the full moon). 

TL;DR maybe the “corridor of dreams” that Danan uses is some kind of plane, like the astral plane, that can be accessed through the world tree.
And maybe, during full moons, the demon infant has enough powers to materialize his dearest dream for one night, which is to say he “dreams” of being a young boy able to spend time with his parents, which is why a corporeal moonlight child materializes where his parents are.

Sorry if something doesn’t make sense, but feel free to leave your thoughts!