Soul Slate.
It was a term that every Esper and Climber knew about instinctively.
Mysticism and supernatural studies states that every living organism possessed a Soul within their bodies.
Individuals who were religious would call it the "Divine Spark" bestowed by higher powers. Philosophers, on the other hand, regarded it as the Seat of Consciousness — the true essence that defined one's existence.
Some schools of thought even explained the nature of the Soul through concepts found in Kabbalah, a system developed from early Jewish mysticism (such as Merkavah, or "Chariot" mysticism) around the 1st century CE, though it truly flourished in medieval Spain and southern France between the 12th and 13th centuries.
