Mahākāla is a deity common to Hinduism and Tantric Buddhism. In Buddhism, Mahākāla is regarded as the sacred Dharmapāla ("Protector of the Dharma"), while in Hinduism, Mahākāla is a fierce manifestation of the Hindu god Shiva and the consort of the goddess Mahākālī; he most prominently appears in the Kalikula sect of Shaktism. Mahākāla also appears as a protector deity in Vajrayana, Chinese Esoteric, and Tibetan Buddhism (see Citipati), and also in the Chàn and Shingon traditions. He is known as Dàhēitiān and Daaih'hāktīn (大黑天) in Mandarin and Cantonese, Daeheukcheon (대흑천) in Korean, Đại Hắc Thiên in Vietnamese, and Daikokuten (大黒天) in Japanese.
is a Sanskrit bahuvrihi of "great" and "time/death", which means "beyond time" or death.
means "Great Black One". "Protector" is also used to refer specifically to Mahākāla.
According to Shaktisamgama Tantra, the spouse of Mahākālī is extremely frightening. Mahākāla has four arms, three eyes and is of the brilliance of 10 million black fires of dissolution, dwells in the midst of eight cremation grounds (śmaśāna). He is adorned with eight human skulls, seated on five corpses, holds a trident (triśūla), a drum, a sword, and a scythe in his hands. He is adorned with ashes from the cremation ground and surrounded by numbers of loudly shrieking vultures and jackals. At his side is his consort, symbolized as Kālī.
Both Mahākāla and Kālī represent the ultimate destructive power of Brahman and they are not bounded by any rules or regulations. They have the power to dissolve even time and space into themselves, and exist as the Void at the dissolution of the universe. They are responsible for the dissolution of the universe at the end of each kalpa. They are also responsible for annihilating great evils and great demons when other Gods, Devas, and even Trimurtis fail to do so. Mahākāla and Kālī annihilate men, women, children, animals, the world, and the entire universe without mercy because they are Kala or Time in the personified form, and Time is not bound by anything, and Time does not show mercy, nor does it wait for anything or anyone.