Vajrasattva represents the synthesis of the Five Dhyani Buddhas a group of five non-historical celestial Buddhas who are visualized during meditation. They are to be distinguished from historical Buddhas, such as Gautama Buddha or Padma Sambhava. Together with Vajrasattva, the Five Dhyani Buddhas are the central deities of esoteric Buddhism.
Meditative powers are secret-ray powers, and the Dhyani Buddhas hold the keys to the mastery of the five secret rays. In fact, in Nepal his worship is always done in secret and is not open to the uninitiated.