Ekajaṭī or Ekajaṭā, [Tibetan ral gcig ma] “one who has one knot of hair] is also known as Māhacīnatārā. She ois 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 Tara", Vajra Tara or "Ugra Tara". 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.