Ekajaṭī or Ekajaṭā (Sanskrit: "One Plait Woman"; : one who has one knot of hair), also known as Māhacīnatārā, is one of the 21 Taras. Ekajati is one of the most powerful and fierce protectors of Vajrayana Buddhist mythology. According to Tibetan legends, her right eye was pierced by the tantric master Padmasambhava so that she could much more effectively help him subjugate Tibetan demons.
Ekajati is also known as "Blue Tārā", "Black Tārā", "Vajra Tārā" or "Ugra Tārā". She is generally considered one of the three principal protectors of the Nyingma school along with Rāhula and Vajrasādhu ().
Often Ekajati appears as liberator in the mandala of the Green Tara. Along with that, her ascribed powers are removing the fear of enemies, spreading joy, and removing personal hindrances on the path to enlightenment.
Ekajati is the protector of secret mantras and "as the mother of all" represents the ultimate unity. As such, her own mantra is also secret. She is the most important protector of the Vajrayana teachings, especially the Inner Tantras and termas. As the protector of mantra, she supports the practitioner in deciphering symbolic dakini codes and properly determines appropriate times and circumstances for revealing tantric teachings. Because she completely realizes the texts and mantras under her care, she reminds the practitioner of their preciousness and secrecy. Düsum Khyenpa, 1st Karmapa Lama meditated upon her in early childhood.
According to Namkhai Norbu, Ekajati is the principal guardian of the Dzogchen teachings and is "a personification of the essentially non-dual nature of primordial energy."
Dzogchen is the most closely guarded teaching in Tibetan Buddhism, of which Ekajati is a main guardian as mentioned above. It is said that Sri Singha (Sanskrit: ) himself entrusted the "Heart Essence" () teachings to her care. To the great master Longchenpa, who initiated the dissemination of certain Dzogchen teachings, Ekajati offered uncharacteristically personal guidance. In his thirty-second year, Ekajati appeared to Longchenpa, supervising every ritual detail of the Heart Essence of the Dakinis empowerment, insisting on the use of a peacock feather and removing unnecessary basin. When Longchenpa performed the ritual, she nodded her head in approval but corrected his pronunciation. When he recited the mantra, Ekajati admonished him, saying, "Imitate me," and sang it in a strange, harmonious melody in the dakini's language. Later she appeared at the gathering and joyously danced, proclaiming the approval of Padmasambhava and the dakinis.
Origin
Ekajaṭī is found in both the Buddhist and Hindu pantheons; it is most often asserted that she originated in the Buddhist pantheon but some scholars argue this is not necessarily so. It is furthermore believed that Ekajaṭī originated in Tibet, and was introduced from there to Nalanda in the 7th century by (the tantric) Nagarjuna.
It appears that, at least in some contexts, she is treated as an emanation of Akshobhya.
Iconography
She can have dark red or dark blue skin, with a high, red chignon ("she who has but one chignon" is another one of her titles). She has one head, one breast, two arms, and a single eye. However, she can also be depicted with more body parts; up to twelve heads and twenty four arms, with different tantric attributes (sword, kukuri, phurba, blue lotus axe, vajra)