i mean that he is Slendercolt,as a kid. here's his story:
In a forest lived once a colt, often seen in black coated, poor looking and mostly pale and tall. He doesn't liked the villagers and lived by himself, but often the children makes jokes about him,also because he didn't have a cutie mark yet,and they made a test of courage, try to find him. Sometime a Children get lost in the woods because they wasn't able to find the poor colt or the way back home. The villager on the other side suspected the poor colt for the vanish of the kids. So they decide to set the little house of him on fire. He and the house get burned and only the scream from him was heard, cursed the children and the villagers. After this, the kids tell about the piece of forest, where you can still find the burned house of him, and in this piece of forest you can hear him in the night and see him between the trees.