Disclaimer: I do not own the Kingdom Hearts series. The Slender Man Mythos is not my own creation.
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The brown, spiky-haired boy opened his eyes, only to be blinded by a bright light. He put his hand up to block it, and when his eyes adjusted, he looked at his surroundings. He was standing on a stained-glass platform with himself on it, wielding the basic Keyblade, Kingdom Key. Suddenly, a voice, the source of which he could not identify, spoke:
A powerful enemy has come into this universe.
It seeks only to destroy everything, and it will use any means at its disposal to accomplish that.
You must purge it from this universe with the weapon you wield.
The journey will not be easy by any means, and will be very dangerous.
But don't worry. The weapon you wield is the most powerful of them all.
The boy turned around and saw that his shadow has grown to a larger size than usual. Suddenly, it sprang up from the floor, and began to grow to an unusual height. It kept growing, until it finally reached ten feet. But, it no longer bore any similarities to the teenager. It had instead changed into a tall, slender man, with tentacle-like arms, and stick-like legs. But, the most disturbing characteristic of it was that its face- or rather, its non-existent face. It had no nose, no eyes, no mouth, and no hair.
It reached out and beckoned, and several Shadows, the most basic form of Heartless, sprang up from the floor. They rushed toward the boy, and jumped at him, swiping their claws. At the last second, the boy's Keyblade appeared in his hand, and he swung out, destroying the Shadows. They vanished into dark clouds. The boy then ran at the figure, swinging the Keyblade, but at the last second, the figure suddenly dropped down, a dark circle in its place. The circle proceeded to move across to the other side of the platform, and the dark figure sprang up again. He tried throwing the Keyblade at the figure, but again, it merely teleported out of the way. He tried a lunging strike- and this time, he managed to land a blow. The figure also appeared to have been stunned. The boy beat at it multiple times, until it teleported out of the way.
After several more lunging strikes and attacking the figure while it was stunned, the Keyblade disappeared from the boy's hands. The dark figure took this chance to extend its hands and begin to choke the boy. The boy flailed wildly, attempting to escape, but it was no use. Just as everything faded to black, he suddenly saw a light, and a heard a voice that said, "Sora..."
