u/Guizmo_Unicorn

Heya there, this is a theory that I've come up with while watching some recent videos, specifically while watching French streamers reacting to Andrew's last video. This comment originally was in French and was posted under the vod and as a comment under andrew's video (so sorry if it sounds bad) It's still early and not very well thought out as it is, but it's a start and kind of all over the place at the moment. I wrote this at 3 a.m. on a weekday, please be kind.

* For the demonic heart, I personally think it's the eye located on the Roaring Knight's torso (eye, crying, get it ?). It's positioned around the ribcage area, so like a heart, and the Knight is associated with water in general: the more damage you deal to him, the more visible the image depths.ogg becomes in the background on the Knight's side, until it fills the entire screen during his final attack, where you can very clearly see the eye from the front. Raise Up Your Bat would then describe the fight where both the Knight and Kris are injured (one crying, the other bleeding), and where our soul is weakened/injured, which would be a turning point for reclaiming rights over our future or creating a new one (?). That raises a paradox, because Raise Up Your Bat would then place Kris and the Knight as demonic entities even though they are precisely "pro-prophecy" simply because they oppose our desire to change our future, just as Gaster would want.
* Something else to take into account: I just wondered why there is this distinction between paradise and heaven, because they're not exactly the same thing. Heaven directly refers to the afterlife, whereas Paradise refers to the Garden of Eden and therefore to a perfect place, devoid of problems in a sense. Even though in French and English both terms are translated as "paradise" and often similarly used, I think it could be interesting to think about them as different things.
Paradise as a perfect place is fictional, so it exists in darkness, i.e. a lower layer of fiction, i.e. underwater. And in a Dark World, you can change outfits, use magic... basically express yourself freely. Conversely, Heaven, referring to afterlife, would be a higher layer. For example, Gaster reached this higher layer by falling into his machine, erasing him from the memory of the world he was in. In a similar way, a Darkner who leaves a Dark World becomes a simple object, which is a sort of pseudo-death for their character. Thus, we have Paradise = underwater, below, more self-expression, and Heaven = in the sky, above, less personal expression.
* Furthermore, I think that since stars can represent dead people / people in the afterlife, a fallen star could be someone who has been resurrected or who has died in a more metaphorical sense (Dess, in my opinion, and the fallen star would be the Knight). This star would then manifest as glass, which is indeed what the Black Shard seems to be made of, and apparently the same material the Knight is made from.
This ties in quite well with before : the eye is the demonic heart, it cries, and those tears then become the rain that falls.
* To push the idea further, we could draw a parallel between stars and people coming from a higher layer, such as Gaster and the Goners (personally, I think Kris and we ourselves are among them; see SpookyDood's video). When we leave a Dark World, our body disappears from that world, while our body in our own layer of reality is still there. Likewise, the Goners would simply be leaving our layer of reality to go back to their original layer when they disappear. Then why the connection with stars? Well, stars are sources of light (links back to us, the soul). We have save points, sources of light that only Kris and we can see, precisely because they are passages, links to the layer above ours and therefore invisible to the other inhabitants. Similarly, the save point located in Hometown is less bright, less visible, because it is only one layer below the original rather than two like in the Dark Worlds, which are darker and therefore have a greater contrast to their surroundings. In short, the save point is a star and therefore linked to Heaven.
* We also notice that the Titan has a star on its "face." That would therefore be the link between the layer of reality it inhabits and the one it originally comes from. As a messenger, it can therefore travel to layers higher than its own thanks to this star.
* Likewise, Dess/Knight is called a fallen star because they visited this higher layer, potentially thanks to Kris, who brought them along just like he carries Lancer or Rouxls (or physically, although I realize that if that were the case, then Lancer and Rouxls would also be stars). But the Titan is special because it is not reduced to an object and retains its original form). In any case, they have now lost this power, hence the term fallen star, and that opening that serves as a mouth/visor could be a kind of two-pointed star, which would be a scar left by this fall from grace.
This star on the face is a potential characteristic of Titans, as represented in the prophecy. Moreover, these Titans are described as those who ravage both worlds, Light and Dark. Yet they come from the Dark Worlds, further showing that they can rise to higher layers and interact with them.

* In the same way, we could say that Hell is both the opposite of Heaven, which is based on ascension: thus, demonic beings would be those who come from a higher layer, i.e. Kris and Dess/Knight, who therefore come from a layer above; and the opposite of Paradise, which is based on the comfort found in lower layers: demonic beings would be the Titans who come from the depths of the abyss, from deeper layers (which goes back to what said Jevil).

We then get a contrast: One man's hell is another man's heaven / paradise / paradise lost (a fairly well-known phrase) -> Changing layers is both paradise and hell and carries a double meaning.

There you go, thanks for reading. Now it just needs to be developed further and checked for consistency with everything else.