A towering humanoid entity that appears only within reflective surfaces, most often mirrors, without warning. Its body is an impossibly dark silhouette that absorbs nearly all light, leaving no visible texture or detail. The only distinguishable features are two luminous white eyes, each swirling like miniature galaxies with endless stars spiraling within them. Below them rests an unnaturally wide mouth that opens into a featureless white void instead of teeth or a throat, as though reality itself has been cut away. No nose, ears, hair, or other facial features can be seen. It never speaks, never blinks, and rarely moves, simply watching from the reflection before disappearing as silently as it arrived.

The Bloody Handprint is a silent humanoid entity that appears beyond The Bloodied Window whenever a fresh, blood-soaked handprint is found on the glass. Its figure resembles that of an unusually tall person, though its arms are slightly too long and its posture never seems entirely natural. Its most disturbing feature is its hands—large, unnaturally complex masses of overlapping fingers ending in jagged, razor-like points. Every inch of them is coated in fresh, dripping blood that never seems to dry. The entity rarely moves beyond slowly raising one of its hands and pressing it against the window, leaving behind another vivid crimson print. It never speaks, never attempts to break the glass, and never looks away. The only reliable method of forcing it to leave is to press the single button beside the chair. The button instantly cleans the blood from The Bloodied Window, erasing every stain and handprint. The moment the last trace of blood disappears, so does The Bloody Handprint, vanishing without a sound for a little while.

Just the ghouls from folktales, zombies if you need more specifics.