While slaying Andhakāsura (Andhakasura), Mahādeva (Mahadeva) created innumerable Mātṛkā (Matrika; lesser female deities), so that they could assist him in slaying the Asura. Ekākṣi (Ekakshi) was one of those Mātṛkā.

Matsyapurāṇa(179.25)