Heruka

Heruka is also a name for the deity of the Cakrasaṃvara Tantra.

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Heruka (Sanskrit; Tibetan: Wylie: khrag 'thung) is the name of a category of wrathful deities, enlightened beings in Vajrayana Buddhism that adopt a fierce countenance to benefit sentient beings. In East Asia, these are called Wisdom Kings.

Herukas represent the embodiment of indivisible bliss and emptiness. They appear as Iṣṭha-devatā (Tibetan: Wylie: yi dam) or meditational deities for tantric sādhanā, usually placed in a mandala and often appearing in Yab-Yum.