Guru Sengé Dradrok
Sengé Dradrok (Wyl. seng ge sgra sgrogs; Eng. 'The Lion's Roar') — one of the Eight Manifestations of Guru Rinpoche.
From A Great Treasure of Blessings, page 30:
Guru Rinpoche challenged and defeated five hundred upholders of wrong views in debate at Bodhgaya. He reversed their magic with the aid of a wrathful mantra given him by the lion-faced dakini Marajita.
He is known as Sengé Dradok, 'The Lion's Roar'.