What is "begtse"

In Tibetan Buddhism Beg-tse (Beg tse; Baik-tse) or Jamsaran ( "the Great Coat of Mail", a loanword from Mongolian begder "coat of mail") is a female dharmapala and the lord of war, in origin a pre-Buddhist war deity of the Mongols.

Begtse has black skin and orange-red hair, two arms (as opposed to other Mahākālas, who have four or six), three blood-shot eyes and is wielding a sword. She wears a chainmail shirt, which gave rise to her name, Jamsaran. She wears a crown of five skulls.

Jamsaran is represented in Mongolian, and to a lesser extent Tibetan, Cham dance.