Psychic Imprint is a language of mental thoughts, imprinted on something with psychic energy. It is akin to the runes on stones, or the writing in books, though much more permanent. Unless painstaking removed, or the underlying item destroyed, psychic imprints last forever.
Psychic imprints can only be "read" by mentalists. The process of making a psychic imprint is costly. Requiring one to give up part of their psychic energy to make the imprint, most take the dark path, channeling the psychic energy of an unwilling subject.