SCP-4999 is a humanoid entity in dark formal attire that appears only beside certain people meeting death alone. Its subjects are the conscious, the solitary, the terminally ill within about twenty minutes of death — it never shows itself to groups, to the unconscious, or to anyone with company. It sits at the bedside, offers a cigarette, and stays quietly until the person passes, then vanishes.
The heart of the horror is the chill cast by its benevolence. It does no harm and merely keeps company, yet its arrival is itself the sign that one is about to die alone. With tenderness and an inevitable ending set side by side, it is counted among the Foundation’s most philosophically unsettling entries.