Patient X was once a "beloved" assistant of Dr. Erasmus Sartorius sometime before 945 GUE. The Dr. found the patient's severed hand to be fitting for his anatomy room in the Gray Mountains Asylum. In 949 GUE, when the Nemesis damaged one of the upper level key pads causing electrical currents to surge over it, the female pilgrim was still able to gain access to this door without electrocuting herself when she used Patient X's severed hand to operate the panel.

IMAGE: Patient X's file in the Gray Mountain Asylum

SOURCE(S): Zork: Nemesis