When the Buddha Shakyamuni subdued Mara, he entered the samadhi called Supreme Victory Over Mara, and from his body, speech, and mind appeared the wrathful deities of Yamantaka. among among the four classes of tantra, the Yamantaka teachings are taught in the class of highest yoga tantra for the purpose of subduing the hostile. The condensed tantra extracted from the thirty-six thousand verses of Mañjurīrī, the root tantra Black Yamāri, the explanatory tantra Six-Faced Youth, and the clear teaching of the wrathful fierce action, the seven-thought Vajrabhairava, were widely propagated in India. Although they had spread in Tibet from the time of the emperors, the period of their greatest spread was when they received direct teachings from Indian paṇḍitas and siddhas, such as Ra Lotsāwa Dorjé Drak, Sachen Künga Nyingpo, Shang Chokdru Sherap Lama, Nyo Lotsāwa Yönten Drak, and Kyo Öjung. Many lineages such as the Ra system spread. Many nonsectarian scholars and adepts who have attained accomplishment by relying on the three—black, red, and fearsome—and who have taught a great many sādhanas, empowerments, transmissions, and stages of esoteric instructions for them, as well as the stages of practice of the individual textual systems of the generation,, completion stage, and so forth, have taught them. In general, in the definitive meaning, this deity is identical in nature to the venerable Mañjuśrī. However, because the consort Viśvarūpā and others supplicated Mañjuśrī, the venerable Mañjuśrī rose in the wrathful form and emanated as Yamāntaka. When he subdued the hosts of Yamas in the palace of the Dharma King Yama in the south of Jambudvīpa, as well as the ten directional protectors, Brahmā, Indra, and other arrogant worldly deities who cause harm to sentient beings, the Dharma King Yama and his retinue offered their life-essence and promised to obey Mañjuśrī’s command. There are many such stories. If you rely on these deities of Yamāntaka, you will gain supreme and ordinary accomplishments, your wisdom of perfectly discerning phenomena will expand, you will be unassailable by any outer or inner obstacle, you will be able to destroy all the evils of the three worlds without exception, you will be able to liberate even enemies in the ten directions by forceful means, and will will be able to accomplish infinite activities such as pacifying en enriching, magnetizing, and subjugating. These and other exceptional benefits are what is called Yamāntaka, who manifests in the form of the wrathful king Indra through his compassionate and skillful methods. In brief, there are many ways of applying the outer, inner, and secret, examples and meanings, explicit hi hidden meanings, temporary and ultimate, and so forth, for the benefit of individual disciples, common and uncommon. However, without properly understanding the mode of being of this or that deity, it is difficult to clearly understand even the essential points. Therefore, it is necessary to study and contemplate an ocean of tantras and fathom their depths.