According to the Gelug and Kagyu schools of Tibetan Buddhism, Vajradhara is also known as the ultimate Primordial Buddha or Adi Buddha. Vajradhara displaced Samantabhadra who remains the Primordial Buddha in the Nyingma or Ancient School and the Sakya school. However, the two are metaphysically equivalent. The Esse of Vajradhara In this portion, we are going to learn about the ease of Vajradhara, after the short etymological description of the word Vajradhara itself. Etymology .