Heruka represents wrathful imagery with indivisible emptiness (śūnyatā), bliss, peace, wisdom, compassion (bodhicitta), and love.
[4] The eight Herukas (Wylie: sgrub pa bka’ brgyad) of the Nyingma mahayoga tradition (and their corresponding sadhanas) are said to have been received by Padmakara from the Eight Vidyadharas (Tib.
Yangdak Thuk, Wylie: yang dag thugs) the wrathful Vajrapani deity of mind; 4) Mahottara (Tib.
Jigten Chotod, ’jig rten mchod bstod) the wrathful Ksitigarbha, the deity of worldly offering and praise; 8) Vajramantrabhiru (Tib.
Padmasambhava is quoted in the Bardo Thodol (Antarabhavatantra - "Tibetan Book of the Dead"): "The crucial point is indeed that those who have meditated on the formal description of these Herukakaya ('bodies of Heruka'), and also made offerings and praise to them, or, at the very least, have simply seen their painted and sculpted images, may recognise the forms that arise here and attain moksha (liberation)."