If the entity lost control over the realm

Think the big players would group up tbh and take over. Pin Head probably in charge with PH, Nemesis, Oni, Knight, Wesker as underlings/enforcers.

If The Architect of the Trials for whatever reason disappeared or ceased using the Trials to siphon the Auric Energy from The Entity, leaving the Trials behind, this is (first take on) what I'd write to happen:

Excess Auric Energy buildup around The Architects Siphons would occur, primarily causing Blight formations in The Basement and around Hooks as Survivors get Hooked in a Realm, but their memories of pain are unable to be siphoned. (Game-wise this could tie into the End-Game Collapse starting as a result of getting several Hooks as a Killer)

Survivors and Killers slowly have their previously suppressed Ego returned, or filled in by the excess Auric Energy intertwining with their memories. This returns the social capability and (likely) dampens the Kill/Survive drive amplified in characters. (Hello voice-lines.)

 Survivors and Killers would no longer be shuffled around Realms when the Trial ends or they Escape. Killers would be left in whatever Realm they are in, Survivors would stay in the forest in the Void (if that's even where they ended up after traversing the Fog outside the Exit Gates). These Realms however would also no longer be "restocked", and would likely be ravaged by the EGC "reset".

Survivors would no longer be dredged up from the Void, at least, not in an "intelligent" manner now. If there was a PvE portion to this game, the constant unchecked dredging of the Void would be the reason behind void monsters coming for characters.

The Entity's Realm is its own dimension and an infinite fractal across the omniverse. The Architects sub-domain is also a fractal, and their Tools now open to all who were once their experiment.

In my opinion, anyone willing to reverse engineer the nature of Auric Energy, and the Architects Tools, would be able to make claim to a new sub-domain. If they used the Architects Tools, they would also be connected to anyone else using the Tools from an Auric connection, having easy access to one another (for good or ill). Some might try exploring the Entities Realm, likely forever being lost.

This all sounds optimistic, but don't forget that in the Entities Realm your loves and more specifically your fears, will become manifest, in a literal sense. And boy howdy fear has a really nasty feedback loop.

Where in the lore is there talk about an Architect of the Trials other than the Entity?

As far as i'm aware from having read the lore, The Entity itself is the only thing that actually creates the trials themselves.

Been a while since I've read through the recent archives.

This is from a worldbuilding standpoint that doesn't require the writers to shoehorn themselves into a box with having a human mind controlling every facet of the Trials (and said logic of why/how are the Trials constructed), and can allow for more explorative writing down the road.

The Entity is a "Horror Dimension Eldritch Being", where it's quite literally the idea of fear, if it weren't just an emotion. It's alive and exists because fear as a concept exists. Existing outside of, but connected to, all other realities that share fear as a concept, being fed Auric Energy by simply being in the presence of negative emotions.

The Entity's dimension, The Realm is itself another reality, infinite in size. However, instead of physical matter, it consists of memories. Memories of how physics works, memories of what a car looks like, memories of what a Generator does, etc. The Trials themselves are memories of locations held by Killers/Survivors, etc.

Given the above, the Trials being so "regulated" doesn't make sense.

You can say that the Trials we play are merely a unique selected subset of all the goings on in the Entity's Realm.

You could also say that the Trials we play are guided by a "Mad Architect" intent on bending the Realm of the Entity for some unknown purpose.

You could also say it's both.

Of course now that I think about it I don't know what OP's post meant by "The Realm", if it was just the Trials or everything.

Except it's already been established that the trials themselves and everything in it other than the Killers & Survivors that The Entity has captured are created and controlled by The Entity itself, along with everything else in The Fog aka The Entity's Realm.

While it's possible for memories to manifest through thought in The Fog, the assumption that The Fog consist only of memories is incorrect, outside of Killers & Survivors who are trapped in The Fog along with the Fog Creatures created by the Entity itself, The Fog actually consist purely of Auric Cells only.

The Entity picks and chooses what does what when it looks at a memory of an area and thinks "this would work as a trial ground" but it does not understand why a house needs to look like a house, hence why we had stuff like old haddonfield houses. You can think of The Entity like an AI that generates content, it can create stuff out from what it interprets it as, but it doesn't truly understand what it's creating, which is why some stuff is so off.

So therefore, it makes perfect sense for the trials to be regulated. If The Entity wanted to outright KILL the Survivors, it wouldnt make it fair at all. but it needs everyone to be kept in an emotional state at all times in order to extract as much Sustenance as it can from both Killers and Survivors.

Which is why the trials are regulated. why pallets exist, the exit gates, etc.

Besides, The Fog and everything within it including the trials as well as all Fog Creatures and the insects and animals like Rats & Crows are all part of The Entity itself since they're all extensions of it, so why wouldn't it control every part of how the trials looks and functions when it's already in full control of it all? (Excluding Survivors and Killers.)

I can't really say the trials have anything to do with any Mad Architect because there doesn't exist one canonically, unless you're thinking of The Mad Designer aka Jezabel who gets mentioned every now and then in the tomes, however she has nothing to do with the trials themselves and are more about drawings, sketches and journals about scenes from other realities or about future events yet to happen.

Perhaps you've looked at the Mad Designer and mistaken them for something like a Mad Architect.

Yep

Isn't it possible that Auric Energy/Cells is "memorystuff", after being "digested" by The Entity? Auric Energy being how it's interpreted by external consciousnesses?

I think this is where my viewpoint and yours diverge.

I don't think The Entity is intelligent in any manner that we understand (Or perhaps even accept as being intelligent). It's less of a "being" and more of a "force of nature". It feeds off of and draws in memories/consciousnesses of things that cause fear, and is simply draw to potent memories/characters relating to that emotion.

But it doesn't think. Think of it like a Black Hole.

Everything gets tossed into The Void, where loose memories are diluted into Auric Energy, including inaccurate ones. (These very same memories turned Auric Energy is what fuel the "Realms" created by the consciousnesses dumped into The Void, on their own tiny little islands)

I also think that the scales we are thinking about are very different.

The Entity doesn't "pick and choose" how an area looks. Saying that it can look one way, or look another, is inaccurate.

It already has all possible permutations of an area setup. As soon as it's thought about, that memory now exists, floating around somewhere. As if The Realm is its own multiverse, capable of generating multiverses, like an infinite fractal.

To restate my viewpoint, I don't think The Entity "controls" anything. It has no intent, by our standards. You may disagree, and on that point it'd be artistic differences.

I find it fun to try and figure out a way to turn every game we've played as Players into in-universe cannon.

So that involved coming up with the above, and subsequently realizing that it would also conveniently allow the old game lore to exist in tandem (where The Entity was more or less a madgod pitting people against one another).

Wasn't sure if BHVR was bringing that back or not, so kinda made an assumption when I heard Mad Designer. (Though I don't know why I thought Mad Architect).

Oh, but if you are looking for "Intent" on bad things or targeted occurrences:

Not everyone is good, and in DBD's lore there's a cult around The Entity.

And IMO that "Entity" is the "Mad Architect". The Observer (one of the many) quite literally gone off the deep end in search for entertainment, horror, power, further delving into the workings of his Auris and The Tower.

Idk if the realms would even exist if the Entity died/was destroyed. The realms are all created by the Entity's will and without that to hold it together my best guess is that the realms would fall apart and dissolve into the void, destroying anyone left inside who couldn't escape. I.e. every survivor who couldn't manipulate auric cells to escape, and pretty much all of the killers except pinhead, freddy and maybe demo if it could travel to the upside down. Perhaps vittorio might be able to escape since canonically he can travel around realms if he learned how to leave the Entity's realm.

how in the world did you even type it like this