The Blue Eagle

So for a while now I have been thinking about how similar the dialogue box of Undertale and Deltarune (Light World) matches FRIEND's whole shtick.

As you can see here the Undertale dialogue box matches FRIEND basically 1:1 (besides the Spare being alternating for obvious reasons).

Another reason for why this theory could be true is the Sword Route.

As we know, the Sword Route is a metaphor for both Undertale and Deltarune, showing both the Genocide and Weird Routes. The device used to play it and thus the interface isthe OddController.

It literally says that the buttons and pink and yellow just like the dialogue boxes and it being tied to the metaphor to Undertale and Deltarune, and FRIEND is pretty telling that the actual box is also FRIEND-related or straight up them.

Now speaking about Undertale. There is a very very important non-dogchecked room:

A FRIEND with a creepy smile? Wonder who it is… Of course it could be flowey but I doubt that he can access secret rooms outside of the actual game. Furthermore, there is no one talking to us (at least anyone who's visible). It could very well be that the dialogue box, being FRIEND, is talking to us through itself about itself.

This is really grasping at straws but guess where the stats/menu screen is. To the left of the player character. The player character mostly faces to the right because that is the direction where they need to go. This means that the stats/menu screen (FRIEND) is behind you.

So basically it started out with me finding out that Deltarune Chapter 5 released. There was no announcement for its release and it seemed like it released secretly meaning you had to find out yourself that there was an update.

When I began playing it started out in this cliffs-like area with only Kris. No Ralsei and no Susie. The only way to go was up and there were multiple paths branching out and joining each other again. Meanwhile, Gaster talked to me. He began talking about how "now I know what the prophecy is" (in the Dream it seemed to me like he was talking about the various prophecies in Ch4). There was also a prophecy-esque image in the bottom right of what seemed like the Delta Rune from the Original Game/Sword Route. That being a Delta Rune with one extra delta right below the oval. It quickly faded out.

Gaster continued to talk but I decided to restart the game for some reason. When I restared it the second image appeared which I assume is a part of the intro to Chapter 5. It was the bottom half of the Delta Rune, that being the heroes. There were three deltas next to eachother: the Cage, the Prince, and what I assume is the Girl with hope crossed on her heart. All of them had the images from the prophecy besides the Girl with hope which had a smiley face akin to the Undertale Genocide Route smiley. Then there was also a fourth Delta Rune separated from the other 3. That one being the last Girl.

Shortly after an image of a document was shown. I wasn't able to read anything but what I think was "Royal Sciences".