Okay, I'll wait.
Above I linked to a wiki. Now, I know, wiki are unreliable, BUT, the only thing that wiki article shows is all the Slenderseries that have been put into the Slenderverse, NOTHING else, which should show you the grand scale of how big the Slenderverse is.
Slenderman in "By The Fire's Light" possesses his own separate reality which he can absorb people too. And this is also selective, as only two people can see it. Now, some context...
Two police officers were trying to publish a book to make The Slenderman seem fake. But it seems in BTFL Slenderman gets more powerful the more famous he is. So, the book got him to be able to create a reality that would engulf the reality of humanity.
CITATION:
Mira looked at the young man. "Kurt Kent? Connor's friend?"
Kurt nodded looking from Mira to Rourke solemnly. "I just wanted to thank you for letting us get out and giving us a chance to get away before the end."
Mira stared at him open-mouthed. "The end? What do you mean?"
The end," he said again, simply. He pointed to the sky above him. Mira and Rourke looked up. Rourke sucked in his breath. The sky looked like it was literally pulling apart at the seams. There was a gigantic rip in the dark blue above them and behind it was a deep burgundy red. What looked liked slime was dripping from it and then a thousand mouths full of sharp teeth opened and roared. Long black tendrils slipped in from the rip and began to dangle down.
"How," Mira said helplessly, only paddling enough to keep afloat.
"I'm afraid it's your fault a little bit," Kurt said, apologetically. Mira stared at him. "Oh, this would have happened eventually I think. You just gave it a little boost."
"How did I give it a boost?" Mira screamed. She looked towards the thing on shore. Standing. Unmoving. Waiting.
"You made us more important," Kurt said, eyes boring into Mira's. "You called us its belief batteries. Before we just gave it the belief of a regular person, albeit boosted a little because we though of nothing but it. You must important, though. Special. You amped up its power through us. And well–" He shrugged. "It doesn't need us anymore."
"Kurt!" the young woman he had left behind called to him urgently.
"Coming, Ellen!" he called backed. He turned to Rourke and Mira. "You should go too. You don't want to be here when its done." He swam away without looking back.
Rourke put an arm around Mira and looked up at the sky. The rip was widening and quickly. The water pulled him backwards oddly and he looked behind him. The water was angling up and back into a looming darkness that was blacker than black, a black so deep his eyes could not process it. A black that hurt to look at. And the blackness was moving forward, sweeping towards them. He looked forward again. Flames and the thing waiting on the beach.
"Mira," he said, quietly. "There's only one way out. Really out. And we need to take it quickly if you want." He squeezed his arm around her. "I said I was with you until the end though, and I meant it."
Mira stared steadily at the Slender Man on the beach. Her eyes narrowed. "You'd like that wouldn't you," she hissed at it. "Well I'm not afraid of this story and where it's taking me!" she screamed at it. It cocked its head but made no move. Mira looked up to Rourke. "This is our world," she said. "And I will not surrender it to that thing."
"Okay," Rourke said, holding her close, bobbing in the water.
Mira wrapped her arms around him and squeezed tight. "It was a corner of darkness in our reality. Maybe we can be a corner of light in its."
They held each other fast as the blackness approached and the sky spilled open above them. The held each other not like lovers, or even like friends, but as a child holds its bear, a last shield against the darkness.
"To the end," Rourke breathed.
"To the end," Mira echoed back.
Then the blackness engulfed them. The world around them fell away and they said no more.
By The Fire's Light-
The End
Slenderman has feats similar to this one in other works that I can find.
