Those Espers who gain their abilities without the aid of special scientific instruments, whether at birth or otherwise, are referred to as Gemstones (原石, Genseki). Others, known as Magicians (魔術師, Majutsushi), gain their powers upon mastering the power of magic, either from obtaining knowledge from different mythologies or by using mystical artifacts, though the existence of magicians is a secret to the public. While Magicians align themselves with different beliefs, Espers are aligned with scientific institutions.