Vecna (SPOILER)

During his quest to destroy humanity, Henry Creel is forced to relive the traumatic memory that began his transformation into the monstrous Vecna. As a child, Henry was shot by a scientist and forced to attack him in self-defense. Noticing the man's briefcase, Henry opens it and finds a strange, glowing stone. Upon touching the stone, Henry is immediately infected by the Mind Flayer, who possesses him, forces him to kill the scientist, and gives the boy one simple command that will drive him for decades to come: "Find me."

Example of:
Start of Darkness