Explanation:

Kapalika and Kalamukha, members of either of two groups of Shaivite (devotees of Shiva) ascetics, most prominent in India from the 8th through the 13th century, who became notorious for their practices of esoteric rituals that allegedly included both animal and human sacrifice, though there is no evidence for the latter. They were successors of the Pashupatas, one of the earliest sects.