Zasa Mergen Baatar, in Buryat mythology, is the tornado-god riding a brown hawk-horse.
[1] Han Hormasta's eldest son Zasa Mergen Baatar married[2] Sesegen Nogoon the daughter of Segeen Sebdeg.
He obtained her as his bride by successfully wrestling (and thereby transforming into the three Sharaidai khan-s) the three sons of Atai Ulaan : Sagaan Hasar Buhe, Shara Hasar Buhe, and Hara Hasar Buhe.
[3]