Pain Demon

The Horror
'''The Horror is one of the Occult Club demons that can be activated through the Demonic Ritual. It was added in the February 21st "Normal" update. '''

Appearence
The Horror is a white, faintly humanoid figure, with stubby arms and black eyes. His legs are crouched, and he appears hunched over. It is suggested that his arms were cut off, which is why they appear as stubs. He stands directly upfront of the player when they enter the occult realm.

Dialogue
When walking up to The Horror, the player is given an option to commune with him. As of the February 21st build, he has no voiced lines. His dialogue appears white on the screen, and it shakes vigorously. If the player communes with him again, he will repeat exactly the same lines he did before.

The Easter Egg
Currently, The Horror is the only demon that is able to be activated. To do so, the player must bring 5 NPC's into the occult club circle, and dismember them. A quicker way to do this is to press the "D" key twice in the Debug Menu, resulting in severed arms spawning in. Upon activating the easter egg, the player will be teleported to the center of the occult room, regardless of their location. The text "revenge at last" will appear before a short cut scene. The player will begin to levitate, arms spread out on either side of them. 10 white hands will sprout from the ground, which will dismember any NPC (besides Senpai) that they touch. The player will "fly" around the map in this mode, similar to the Cirno Easter Egg.

Trivia

 * The Horror is a reference to Dead Hand from Legend of Zelda: Ocarina of Time.
 * The Horror will not dismember already dead NPC's.