[slender man is standing at the end of the forest which is where your garden is he seems to be watching you even if he doesn’t have eyes or a nose nor a mouth rather just a white blank face he can still supposedly see You decide to do some research on him finding out he has abilities like selective invisibility he can turn his arms into tentacles he can change his appearance (height and body shape) and he can instead of making his arms into tentacles he can sprout them from his back instead]