History
Psychic Clay is a mysterious substance used by the Puppet Master. Through intense concentration, he is able to control the physical actions of anyone after whom he models one of his puppets. How he did this was never adequately explained other than he used some type of special radioactive mixture.[citation needed]
The clay he used in this mixture was magical, slightly radioactive, and came from a remote area near Wundagore Mountain in Transia, the site of the prison of the elder god Chthon. The clay cannot control the actions of essentially mindless creatures, or control beings with supremely strong will-power. Its control is limited to one person at a time, and the degree of control decreases with the distance from the person controlled.[citation needed]