>>56820032Yea, I wrote a short story on this concept before. The idea that someone in their world accidentally triggers an ACE by throwing out certain household objects in a specific order and are met with an entity so frightening that upon 1 single glance it distorts their entire sense of sight and they pass out in horror. When they awake, they're "outside" but there are floating bricks, patches beach sand and water just inorganically sprouting from the concrete, voids of absolute darkness with strange symbols and numbers flashing within them, the dismembered bits of themself duplicated and levitating in place as static inorganic objects, etc.
That's how I'd make it. Like you accidentally performed a ritual that summoned an elder god - and that being doesn't particularly want anything to do with you but just upon seeing it you've descended into madness. You accidentally broke the rules of the game you're confined in. Nothing was out to get you, it was simply an oversight in the universe's code that you escaped the sandbox you've been confined in. The horrors you witness are not a result of some malicious intent, rather you getting a peak under the hood of what the universe is truly composed of, and you're just not equipped to fully grasp that form.
Missingno is terrifying because it's almost like you're performing a dark ritual just to even encounter it. And once you do, how far down the rabbit hole you go depends on how much you want to interact with it. You can run away and live to see another day, even if a little mentally scarred. Things like hall of fame and item corruption. Or, you can capture it and try learning its secrets, only to find your reality gradually unravel into something entirely alien. When I was a kid I was so obsessed with these things that I'd use Action Replay encounter codes and purposefully plug my own values in, that weren't listed on any game sites, to summon a variety of glitch mons, one of them perma corrupted even New Game files.