Gatekeyper Backstory

His name was "Sunny" who was an average robloxian inventor that lived in. Well. Robloxia
He was very good at what he did, but didnt get a lot of work from the general public
One day, DOOM HIMSELF appears at this small investor's shop. They're terrified, and is 100% certain he's about to be imprisoned for something he didn't do, when Doom stops him - Doombringer wants something from them
Doombringer, growing slightly tired of the way things are handled in Robloxia and wanting a new way to deal with troublemakers (also known as; the spectre's influence had juuuust slightly begun), wants to commission this low-level street inventor to make something for him. With what, exactly? Doombringer's very own shard of the darkheart.
Doombringer wants Sunny to create a new form of imprisonment, something that's much more...permanent. than the cages and heat of the banlands.
At first, Sunny denies, bashfully expressing his gratitude and preparing to (somehow) ask Doom to leave, but then...well, doombringer shows the "reward" for doing so. (That being a lot of money).
Sunny accepts the offer. And gets to work. And eventually...creates something he calls "Content Deletion", or just the Lock.
Its a small, black lock with an open hinge. He demonstrates it to Doom by bringing in a mug. They set it down on the table, and snap the lock onto the mug's handle - and it vanishes.
Doombringer is very pleased, and Sunny is paid handsomely as long as he keeps supplying these Locks to Doom. And for the first time in his life, Sunny is able to live a good, simple life that isn't constantly scrounging around for rent in the backstreets
However, more and more reports of people just...vanishing keep coming on the news. More issues of those who committed even the most minor infraction just dropping off the face of the earth. And while Sunny has their...suspicions, to say the least, he ignores it for now. He can't think about it, or it'll drive him batty.
However, he gets more and more uneasy and guilty at the thought of what doom could be doing with these things, and eventually, one night, he calls doombringer and tells the warden that "the deal is off" and "he'll supply this last batch of locks and then he's out".

Doombringer clenched his fists. That wasn't what he wanted to hear.
Doombringer arrives that same night to collect the locks, and while in a conversation with Sunny, unknowingly has him backed into a corner. Doom reveals to the inventor that he can't have anyone whistleblowing what he's made or what he's done, and that, while unfortunate for talent such as the young adult robloxian, he has to go. Sunny tries to book it but gets slammed back to the wall as doom attempts to wrestle the lock around his neck. Eventually, he clicks the lock, and...poof. like They were never there.
However, he discovers that was the last lock sunny ever made, and the whole thing about delivering a final batch was a sham.

Did Sunny...intend to do the same to Doom? He couldn't tell.
Anyhow, back with him...our inventor wakes up in some inky black landscape of nothing. He looks around, his eyes adjusting to the darkness, and he sees...well.
He sees the death of creativity. He sees floating buildings just stranded in the air. He sees vagrant bodies of people - not dead, just...unresponsive. he cant bear to imagine why. The guilt wrecks him. He made this? He made...this? the shame, the guilt, the fear...it's almost too much. So they curl up on the group and they wait to die.
And they wait, they wait. They wait. They wait until they've thought everything they can think and then some. They wait until their thoughts loop for a second time. They wait, and they wait, and they wait.
And after a while, only after this inky black goop has collected on their arms and legs, and covered over half their face, do they realize - they're not hungry, or thirsty, or sick, or tired...or anything. In fact, he doesnt think he slept once. He just held his eyes shut.
There are some things he is now, however. Guilty. Sorrowful. Somewhat rageful. And...the worst one put of all of them, easily...is the boredom. The endless, unceasing boredom.
There's no color, no joy. No troubles, no hardship, no...nothing. just an endless stasis.
He wanders for days. Months. Years. The scenery never changes. After walking for maybe a decade, he sits and tries to make things out of the sludge. It never holds shape. His grasp on reality starts to slip. He grabs a floating key, stabs it right through his skull with his newfound strength. Nothing. No pain, no pleasure, no feeling. Nothing.
At this point, he starts making worlds in his head. He closes his eyes and tries to imagine colors again. They're so dull, and dim. What does the sun feel like, again? It's been so long since he's been warm. It's so cold in here.
Eventually, even living whole different lives in his head isn't enough. He opens his eyes. It's the same as he left it.
How long had he been in here? Hundreds of years? Thousands? Tens of thousands? It's eternity in here. And he hasn't even felt the first second of eternity.
They finally start to scream, to weep, to sob for the first time since he arrived in this hell pit. It's been so long since they last spoke that their voice is nonexistent. They slam themselves against the floor, bash their head into the sludge of ink, to no avail. He curls up on the floor, feeling the inky darkness overtake him. Is this what his invention subjected others to? How many others? He created...this? He couldnt believe it. He cant think about that. It'll drive them batty. He's on his last tear, begging, sobbing anyone, anything to help him. To save him from this. That he's apologize to anyone, do anything just to leave. He'd fight. He'd maim. He'd kill. what he doesn't know, is that he's only been in there for five days.

And the sky turns a bright red - and they collapse onto the bright green grass of some field. Air forces it's way into the lungs of a being that hasn't breathed in eons. And thus, the Gatekeyper takes their first breath in the realm of the Spectre.