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Talking 'Bout Static (Atlas!au)
(This is to explain the main premise that this au branches off on, which is Static/Snow. Both words define the same thing, so I am going to be using them interchangeably, though Static is going to be the 'official' definition of it.)
Static itself is a dimension shelfed between the Infinite Realms and the Living World. It is also a state of being. Similar to its own position, beings who are interchangeably in-between life and death have a stronger grasp on their powers within the dimension. Ghosts and Humans, however? not so much.
Human brains and its basic understanding cannot handle the constant droning and abysmal sight that is given within Snow, and typically die from an overload of information almost instantly. If the human has lost one of its senses beforehand, they are able to exist for slightly longer, but the physical pressure typically implodes the body after about 13 minutes.

Ghosts do actually have a way to survive within Static! If the ghost was to willingly give up what little humanity and sanity it possesses in return of functioning by pure instinct and obsession alone, it can survive within Snow! Granted, that ‘surviving’ is being a feral creature of sin named Noises, a Noise singular. But it still does exist somewhat! No longer considered a ghost or conscious, but points count for something, right? (A group of Noises is known as a Wave).
Newly formed ghosts coming from the Living World are able to survive Static if they happen to temporarily slip into it while transferring their core and soul in the Infinite Realms. They do need to actually end up in the Infinite Realms eventually, or else they will become a full ghost and be affected by Snow accordingly.

It is unknown if a Halfa is able to survive or stay sane within Static.
Accessing Snow is quite difficult, but not as difficult as you may think. Travelling in-between dimensions has a rare chance of teleporting you into Static. This is why freshly made ghosts can fall into Static with no warning beforehand. Natural portals can also do this, but the typical green swirls it has will be replaced with, well, Static. So as long as you pay attention to the physical properties of a portal, you can tell whether or not it is to Static, or to the opposite dimension of the one you are currently inhabiting. (Infinite Realms to Living World and vice versa).

It is unknown how to detect a Static portal when creating a permanent portal, remain cautious when travelling within them.
Static's liminality in relation to dimensions is also connected to their absence of connection to Time. Meaning the appearances of Static portals happen in every timeline, every moment, and during the absence of every moment as well, measured as it is. This appears to carry over onto Noises in some way.
Now, with all of this information in mind, wouldn't it be terrible for a young Hlafa to fall into Static, be captured by a Wave, be used as a stable beacon to infinitely generate and replace all ghost portals with Static ones, and force themselves to march onto the Realms and Earth to kill all humans and transfer all ghosts into Nosies, leaving the isolated humans and ghosts to attempt to fight off these creatures (and some freaky guy named Atlas what the hell), with no idea on how to stop the invasion of Static? That would be quite terrible, wouldn't it.
;)
