Major scholars of competing Hindu traditions from the second half of the 1st millennium CE, such as Adi Shankara of Advaita Vedanta and Ramanuja of Vaishnavism, mention several Shaiva sects, particularly the four groups: Pashupata, Lakulisha, tantric Shaiva and Kapalika. The description is conflicting, with some texts stating the tantric, puranik and Vedic traditions of Shaivism to be hostile to each other while others suggest them to be amicable sub-traditions. Some texts state that Kapalikas reject the Vedas and are involved in extreme experimentation, while others state the Shaiva sub-traditions revere the Vedas but are non-Puranik.