 The Ngor Mandala collection of the Sakya tradition alone lists eight different forms/lineages of the blue/black buffalo-faced Vajrabhairava (which include the two Gelug ones) and four of red Rakta- or blue Krishna-Yamari (all without the buffalo head).All the former are yidams (meditational deities) whereas Yamaraja (sometimes also called Dharamaraja) is a Dharma protector.Rakta Yamari of Virupa and Rakta Yamari of Shridhara appear in chapter 8 of The Collection of All Tantras, compiled by Jamyang Khyentse Wangpo and Jamyang Loter Wangpo.