Garuda Purana tells that Vishnu will born to kill an asura. Vishnu takes the form of an eunuch
The gods would be divided into different clans such as the Svadharmans, Sutapasas, Haritas, Rohitas, etc., and Rtadhama or Bhadra would be their Indra or overlord. The demon Taraka would invade the territories of the then lord of the celestials. O Sankara, the god Hari, incarnate as a eunuch, would destroy that fell perace-breaker of the universe.
Do any scripture tells the name of the avatar mentioned?