The Archangel of Pain

In the days before the Fall, the prophet Ynshimael sought to save himself by crafting a device to trap daemonic entities. Ynshimael's artifice was clever yet inadequate in the face of Slaanesh's birth, and his soul was devoured in seconds. Since those days, the device has been perverted by Ynshimael's Commorrite successors, becoming the metaphysical prison known as the Archangel of Pain. It is used to trap Daemons, binding them in a pit of barbed nothingness that tears and tortures their empyric substance. When released, these entities flee back into the Warp, their soul-rending psychic screams driving those that hear them irredeemably mad.