The nine chosen beta testers were picked from the remaining choices after all the filtering was done. It took some time, yet the selection was made. The system went about altering and updating those nine accounts for both layers of The Decagon itself. They would have the same basic stats within the game world and their current 'reality' as well. Though their skills and abilities would only be accessible in the game world only. Once the process starts, the announcement will be the only time the system forces everyone into the game world, regardless of their current status at the moment. Even if they had long since quit the game or were mentally broken from the reveal of them being trapped in the game, it did not matter, as every beta tester was in the game world.
If everyone was given the option to create their own demon form at the very start of the process, how was it that no one leaked this information once they had gotten into the game world itself? Well, they overwhelm them with other things that serve as a distraction. Also, the amount of detail and levels they were detailed with when going about the creation process gave them the wrong impression that the process of becoming a demon was late mid game to end game content. Thus, they were not expecting it to pop this soon; also, it just was not considered something to do as they reveal their hand too soon to anyone, after all. If they had the possibility of gaining a trump card, then they were not going to waste it by revealing it too soon. Then there was revealing it too soon, and then not ever getting it at all. The embarrassment and shame that could come from such an action would be on another level, after all.
Also, another way to ensure that no one would know who the nine demons were was to make sure that all the beta testers, in general, the ones that were and were not playing within the game world, were kicked out of the game at the same time. Then, once they were all logged out of the game world forcefully, they were all logged back into the game world just as forcefully, but in a random location within their starting region. Not their starting area, as that would prove to be problematic for what came next. As this process was done to prevent anyone from getting an idea of who the nine demons were, by figuring out who was not present within the starting area itself. As if only one beta tester was not present within the starting area, then it would be possible for someone to figure that out. How they would do that would be unlikely, but some people can look at a photo and figure out where that picture was taken. The truly skilled could do it without relying too much on the internet for help, which they did not have at the facility itself. However, given enough time and effort, someone might be able to figure it out, as improbable does not mean impossible, after all.
Genuity, Drive, Passion, Spite, Stupidity, Love, and Will
Seven things that one should never underestimate when it comes to humans. Their ceiling for the positive version of these seven is as high as the depths for the negative version of them as well. This positive and negative version of the seven, thus not specifically good nor evil or light and dark. The moral side of things for the seven of them is not exactly the prime factor in determining what each of them is.
Thus, the random and forced logging out and then immediately back in of every beta tester led to massive panic, as however this was not stopped by the only announcement that was give game world wide thus far. Those who were too busy panicking and freak out only heard it as very loud background noise that was excessively loud to the players, at least. Though there was another reason why some players were distracted, and it was not because of anything that happened to them directly, but because of what they were seeing themselves. That was a sight that was only visible once within the game world itself.
The currently only appearance of all nine demons at the same time
All nine of them appear within a random area within nine of the starting region, thrashing and carrying out as if they were just reacting normally from their point of view. Even those who were not panicking or freaking out over what happened to them, their actions looked different to those who were looking at them from the player's point of view, since this was the demons in their true massive kaiju form. If any players were unlucky enough to have a place in the exact general area of the demon, they were getting killed repeatedly by it without them even being aware that it was happening to them. Thus, so much rivalry and even worse were being formed without them even being aware of it. After all, when they are that large and massive, it is hard to notice every little thing that can be crushed under their massive body weight without their awareness of it happening.
As for why the announcement was so loud, that was also because of the demons as well. The sound of a normal person's voice could not passively be heard by their ears in any normal sense, after all. It had to be something that they were capable of hearing without having excessively good hearing to hear something coming from something so massively small in compared to them. This was an announcement being made, so beings that were ranging from one hundred to three hundred feet tall and wide, after all. What was excessively loud to a player was merely just the average level required for them to be able to do so normally, without having to focus intensely to do so.
Eventually, the demons would learn that while their true forms were massive kaiju forms, they could appear in three different heights. The smallest height in their demon form could shrink down to was considered massive to a mere player. It was just that the only difference was how massive, when compared to the players, they were, not if they were massive, which they always were.