What REALLY is the Slender Man?

Slenderman has been around for over a decade now and has changed from his original concept to the modern ghostlike man who stands around and scares you. But what was he back in the day? What is his official canon? What is the Slender Man really? Support me here! If you want. Patreon:   / nemesisbloodryche   Bsky: https://bsky.app/profile/bloodryche.b...