Dharmakāya
... Dharmakaya constitutes the unmanifested, "inconceivable" (Sanskrit acintya) aspect of a Buddha, out of which Buddhas arise and to which they return after their dissolution ... Buddhas are manifestations of the dharmakaya called nirmanakaya (Skt Transformation body) ... Movement of Thailand, and the Tathagatagarbha Sutras of ancient Indian tradition, view the Dharmakaya as the true Self of the Buddha, present within all beings ...